Merge pull request 'Implement CSRF protection for user invitation and management actions; add QR code generation script; secure internal includes directory with .htaccess' (#46) from dev into main

Reviewed-on: #46

admin.php

@@ -27,6 +27,10 @@ if (!empty($_GET['success'])) {
 
 // POST Verwerking VÓÓR header output zodat redirects en opslaan vlekkeloos werken
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    if (!verify_csrf_token($_POST['csrf_token'] ?? null)) {
+        $message = "Beveiligingsfout: CSRF-token ongeldig of verlopen. Ververs de pagina en probeer opnieuw.";
+        $messageType = 'error';
+    } else {
         $action = $_POST['action'] ?? '';
 
     // 1. Centrale Azure App Registratie opslaan
@@ -194,7 +198,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
 
         $currentAi = get_ai_settings();
         if ($apiKeyIn !== '' && $apiKeyIn !== '••••••••••••••••') {
-            set_system_setting('ai_api_key', $apiKeyIn);
+            set_system_setting('ai_api_key', fociz_encrypt($apiKeyIn));
         }
 
         set_system_setting('ai_enabled', $aiEnabled);
@@ -224,6 +228,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         }
     }
     }
+}
 
 // Haal actuele configuratie op
 $appConfig = microsoft_get_app_config();
@@ -425,6 +430,7 @@ require_once __DIR__ . '/includes/header.php';
 
                 <form method="POST" class="mt-6 space-y-5">
                     <input type="hidden" name="action" value="save_azure">
+                    <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
                     <!-- Redirect URI Kopieerbox -->
                     <div class="p-4 rounded-2xl bg-slate-50 dark:bg-[#0c0f17] border border-slate-200 dark:border-slate-800 space-y-2">
@@ -563,6 +569,7 @@ require_once __DIR__ . '/includes/header.php';
 
                 <form method="POST" class="mt-6 space-y-4">
                     <input type="hidden" name="action" value="save_jira_domain">
+                    <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
                     <div>
                         <label class="block text-xs font-semibold text-slate-700 dark:text-slate-300 mb-1.5">
@@ -697,8 +704,9 @@ require_once __DIR__ . '/includes/header.php';
                                         <form method="POST" action="/admin.php" onsubmit="return confirm('Weet u zeker dat u het filter \'<?= htmlspecialchars(addslashes($filter['filter_name'])) ?>\' wilt verwijderen?');" class="inline">
                                             <input type="hidden" name="action" value="delete_jira_queue_filter">
                                             <input type="hidden" name="filter_id" value="<?= (int)$filter['id'] ?>">
+                                            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
                                             <button type="submit" class="p-2 rounded-xl text-rose-600 hover:bg-rose-50 dark:hover:bg-rose-950/40 transition cursor-pointer" title="Verwijderen">
-                                                <i data-lucide="trash-2" class="w-4 h-4"></i>
+                                                <i data-lucide="trash-2" class="w-4 h-4 inline"></i>
                                             </button>
                                         </form>
                                     </div>
@@ -724,6 +732,7 @@ require_once __DIR__ . '/includes/header.php';
 
                     <form method="POST" action="/admin.php" class="space-y-4">
                         <input type="hidden" name="action" value="save_user_jira_assignments">
+                        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
                         <div class="overflow-x-auto rounded-2xl border border-slate-200 dark:border-slate-800">
                             <table class="w-full text-left text-xs">
@@ -805,6 +814,7 @@ require_once __DIR__ . '/includes/header.php';
 
                     <form method="POST" action="/admin.php" class="mt-4 space-y-4">
                         <input type="hidden" name="action" value="save_jira_queue_filter">
+                        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
                         <input type="hidden" id="filterModal_id" name="filter_id" value="0">
 
                         <div class="grid grid-cols-1 sm:grid-cols-2 gap-3">
@@ -881,6 +891,7 @@ require_once __DIR__ . '/includes/header.php';
 
                 <form method="POST" action="/admin.php" class="space-y-4">
                     <input type="hidden" name="action" value="save_workday_settings">
+                    <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
                     <div class="grid grid-cols-1 sm:grid-cols-2 gap-4">
                         <!-- Werkdag uren -->
@@ -993,6 +1004,7 @@ require_once __DIR__ . '/includes/header.php';
 
                 <form method="POST" action="/admin.php" class="space-y-4">
                     <input type="hidden" name="action" value="save_ai_settings">
+                    <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
                     <div class="p-3.5 rounded-2xl bg-amber-50/70 dark:bg-amber-950/20 border border-amber-200/70 dark:border-amber-800/40">
                         <label class="flex items-center space-x-2 text-xs text-amber-900 dark:text-amber-200 cursor-pointer select-none">
@@ -1080,6 +1092,7 @@ require_once __DIR__ . '/includes/header.php';
 
                     <form method="POST" action="/admin.php" class="flex flex-col sm:flex-row gap-2.5">
                         <input type="hidden" name="action" value="send_test_email">
+                        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
                         <div class="relative flex-1">
                             <input 
                                 type="email" 

api/board.php

@@ -431,7 +431,9 @@ try {
         $targetLaneId = (int)($input['target_lane_id'] ?? 0);
         $targetPosition = (int)($input['target_position'] ?? 0);
 
-        $card = $db->query("SELECT * FROM board_cards WHERE id = {$cardId}")->fetch();
+        $stmtCard = $db->prepare("SELECT * FROM board_cards WHERE id = ?");
+        $stmtCard->execute([$cardId]);
+        $card = $stmtCard->fetch();
         if (!$card) {
             echo json_encode(['success' => false, 'error' => 'Taak niet gevonden.']);
             exit;
@@ -443,6 +445,15 @@ try {
             exit;
         }
 
+        // Valideer of de doellane daadwerkelijk bij hetzelfde bord hoort (voorkom IDOR/lane hijacking)
+        $stmtLane = $db->prepare("SELECT id FROM board_lanes WHERE id = ? AND board_id = ?");
+        $stmtLane->execute([$targetLaneId, (int)$card['board_id']]);
+        if (!$stmtLane->fetch()) {
+            http_response_code(400);
+            echo json_encode(['success' => false, 'error' => 'Ongeldige doellane voor dit bord.']);
+            exit;
+        }
+
         $stmt = $db->prepare("UPDATE board_cards SET lane_id = ?, position = ? WHERE id = ?");
         $stmt->execute([$targetLaneId, $targetPosition, $cardId]);
 

api/brainstorm.php

@@ -47,11 +47,25 @@ try {
         exit;
     }
 
-    // 2. Stemmen / Upvote op kaart
+    // 2. Stemmen / Upvote op kaart (met bescherming tegen oneindig stemmen)
     if ($action === 'vote_card') {
         $data = json_decode(file_get_contents('php://input'), true);
         $cardId = (int)($data['card_id'] ?? 0);
 
+        if (!isset($_SESSION['voted_cards'])) {
+            $_SESSION['voted_cards'] = [];
+        }
+
+        if (in_array($cardId, $_SESSION['voted_cards'])) {
+            $stmtVotes = $db->prepare("SELECT votes FROM brainstorm_cards WHERE id = ?");
+            $stmtVotes->execute([$cardId]);
+            $votes = (int)$stmtVotes->fetchColumn();
+            echo json_encode(['success' => false, 'error' => 'U heeft al op deze kaart gestemd.', 'votes' => $votes]);
+            exit;
+        }
+
+        $_SESSION['voted_cards'][] = $cardId;
+
         $stmt = $db->prepare("UPDATE brainstorm_cards SET votes = votes + 1 WHERE id = ?");
         $stmt->execute([$cardId]);
 
@@ -63,11 +77,35 @@ try {
         exit;
     }
 
-    // 3. Kaart verwijderen
+    // 3. Kaart verwijderen (met autorisatiecontrole: auteur, sessie-eigenaar of beheerder)
     if ($action === 'delete_card') {
         $data = json_decode(file_get_contents('php://input'), true);
         $cardId = (int)($data['card_id'] ?? 0);
 
+        $stmtCheck = $db->prepare("
+            SELECT c.*, s.created_by_id as session_owner_id 
+            FROM brainstorm_cards c
+            JOIN brainstorm_sessions s ON c.session_id = s.id
+            WHERE c.id = ?
+        ");
+        $stmtCheck->execute([$cardId]);
+        $card = $stmtCheck->fetch();
+
+        if (!$card) {
+            echo json_encode(['error' => 'Kaart niet gevonden']);
+            exit;
+        }
+
+        $isAuthor = ($card['author_name'] === $user['name']);
+        $isSessionOwner = ((int)$card['session_owner_id'] === (int)$user['id']);
+        $isAdmin = ($user['role'] === 'ADMIN');
+
+        if (!$isAuthor && !$isSessionOwner && !$isAdmin) {
+            http_response_code(403);
+            echo json_encode(['error' => 'Geen toestemming om deze kaart te verwijderen.']);
+            exit;
+        }
+
         $stmt = $db->prepare("DELETE FROM brainstorm_cards WHERE id = ?");
         $stmt->execute([$cardId]);
 

api/webhooks/jira.php

@@ -9,16 +9,20 @@ require_once __DIR__ . '/../../config/database.php';
 
 header('Content-Type: application/json');
 
-// Beveiligingscontrole: Verifieer geheime webhook token indien geconfigureerd in .env
+// Beveiligingscontrole: Verifieer geheime webhook token. Weiger toegang als secret ontbreekt.
 $configuredSecret = fociz_env('JIRA_WEBHOOK_SECRET', '');
-if (!empty($configuredSecret)) {
+if (empty($configuredSecret)) {
+    http_response_code(403);
+    echo json_encode(['error' => 'Jira webhooks zijn niet ingeschakeld of geconfigureerd op deze server.']);
+    exit;
+}
+
 $incomingSecret = $_GET['secret'] ?? ($_SERVER['HTTP_X_ATLASSIAN_WEBHOOK_SECRET'] ?? '');
-    if (!hash_equals($configuredSecret, $incomingSecret)) {
+if (empty($incomingSecret) || !hash_equals($configuredSecret, $incomingSecret)) {
     http_response_code(401);
     echo json_encode(['error' => 'Onbevoegde webhook aanroep']);
     exit;
 }
-}
 
 $rawPayload = file_get_contents('php://input');
 $data = json_decode($rawPayload, true);

auth/forgot-password.php

@@ -18,11 +18,24 @@ $error = null;
 $submitted = false;
 
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
-    $email = strtolower(trim($_POST['email'] ?? ''));
+    $clientIp = fociz_get_client_ip();
+    $ipRateKey = "forgot_ip_{$clientIp}";
+    $ipLimit = fociz_check_rate_limit($ipRateKey, 5, 900);
 
-    if (empty($email) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
+    $email = strtolower(trim($_POST['email'] ?? ''));
+    $emailRateKey = "forgot_email_{$email}";
+    $emailLimit = fociz_check_rate_limit($emailRateKey, 3, 900);
+
+    if (!verify_csrf_token($_POST['csrf_token'] ?? null)) {
+        $error = "Sessie verlopen of beveiligingstoken ongeldig. Ververs de pagina en probeer opnieuw.";
+    } elseif (!$ipLimit['allowed'] || !$emailLimit['allowed']) {
+        $retryAfter = max($ipLimit['retry_after'], $emailLimit['retry_after']);
+        $error = "Te veel herstelaanvragen. Probeer het over " . ceil($retryAfter / 60) . " minuten opnieuw.";
+    } elseif (empty($email) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
         $error = "Vul een geldig e-mailadres in.";
     } else {
+        fociz_hit_rate_limit($ipRateKey, 900);
+        fociz_hit_rate_limit($emailRateKey, 900);
         try {
             $db = get_db_connection();
 
@@ -176,6 +189,7 @@ $pageTitle = "Fociz — Wachtwoord Vergeten";
         </div>
     <?php else: ?>
         <form method="POST" action="/auth/forgot-password.php" class="space-y-4">
+            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
             <div>
                 <label class="block text-xs font-semibold text-slate-700 dark:text-slate-300 mb-1">Uw e-mailadres</label>
                 <div class="relative">

auth/invite.php

@@ -191,7 +191,7 @@ $pageTitle = "Fociz — Uitnodiging Accepteren";
             </p>
 
             <div class="inline-block p-3 bg-white rounded-2xl shadow-xs border border-slate-200 dark:border-slate-800">
-                <img src="<?= htmlspecialchars($qrCodeUrl) ?>" alt="2FA QR Code" class="w-40 h-40 mx-auto">
+                <div id="qrcode" class="w-40 h-40 mx-auto flex items-center justify-center"></div>
             </div>
 
             <div class="bg-slate-50 dark:bg-[#0c0f17] border border-slate-200 dark:border-slate-800 rounded-xl p-2.5 text-xs text-slate-600 dark:text-slate-400 max-w-sm mx-auto font-mono">
@@ -213,8 +213,20 @@ $pageTitle = "Fociz — Uitnodiging Accepteren";
     </form>
 </div>
 
+<script src="/assets/js/qrcode.min.js"></script>
 <script>
     if (typeof lucide !== 'undefined') lucide.createIcons();
+    const qrContainer = document.getElementById('qrcode');
+    if (qrContainer) {
+        new QRCode(qrContainer, {
+            text: <?= json_encode($otpAuthUrl) ?>,
+            width: 160,
+            height: 160,
+            colorDark: '#000000',
+            colorLight: '#ffffff',
+            correctLevel: QRCode.CorrectLevel.M
+        });
+    }
 </script>
 </body>
 </html>

auth/login.php

@@ -42,13 +42,24 @@ if (isset($_GET['action']) && $_GET['action'] === 'restart') {
 // POST Verwerking
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     $db = get_db_connection();
+    $clientIp = fociz_get_client_ip();
+    $ipRateKey = "login_ip_{$clientIp}";
+    $ipLimit = fociz_check_rate_limit($ipRateKey, 10, 900);
 
+    if (!verify_csrf_token($_POST['csrf_token'] ?? null)) {
+        $error = "Sessie verlopen of beveiligingstoken ongeldig. Ververs de pagina en probeer opnieuw.";
+    } elseif (!$ipLimit['allowed']) {
+        $error = "Te veel inlogpogingen vanaf dit netwerkadres. Probeer het over " . ceil($ipLimit['retry_after'] / 60) . " minuten opnieuw.";
+    } elseif ($step === 1) {
         // STAP 1: Wachtwoord verificatie
-    if ($step === 1) {
         $email = strtolower(trim($_POST['email'] ?? ''));
         $password = $_POST['password'] ?? '';
+        $emailRateKey = "login_email_{$email}";
+        $emailLimit = fociz_check_rate_limit($emailRateKey, 5, 900);
 
-        if (empty($email) || empty($password)) {
+        if (!$emailLimit['allowed']) {
+            $error = "Dit account is tijdelijk geblokkeerd wegens te veel mislukte pogingen. Probeer het over " . ceil($emailLimit['retry_after'] / 60) . " minuten opnieuw.";
+        } elseif (empty($email) || empty($password)) {
             $error = "Vul e-mailadres en wachtwoord in.";
         } else {
             $stmt = $db->prepare("SELECT id, name, email, password_hash, two_factor_secret, two_factor_enabled FROM users WHERE email = ?");
@@ -56,8 +67,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             $user = $stmt->fetch();
 
             if ($user && password_verify($password, $user['password_hash'])) {
+                fociz_clear_rate_limit($emailRateKey);
                 // Controleer of de inloglocatie/IP bekend is
-                $clientIp = fociz_get_client_ip();
                 $isIpKnown = fociz_is_ip_known_for_user((int)$user['id'], $clientIp);
 
                 if (!$isIpKnown) {
@@ -72,6 +83,10 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                     $step = 2;
                 }
             } else {
+                fociz_hit_rate_limit($ipRateKey, 900);
+                if (!empty($email)) {
+                    fociz_hit_rate_limit($emailRateKey, 900);
+                }
                 $error = "Onjuist e-mailadres of wachtwoord.";
             }
         }
@@ -86,7 +101,12 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             exit;
         }
 
-        if (empty($totpCode)) {
+        $totpRateKey = "login_totp_{$userId}";
+        $totpLimit = fociz_check_rate_limit($totpRateKey, 5, 900);
+
+        if (!$totpLimit['allowed']) {
+            $error = "Te veel ongeldige verificatiecodes. Probeer het over " . ceil($totpLimit['retry_after'] / 60) . " minuten opnieuw.";
+        } elseif (empty($totpCode)) {
             $error = "Vul de 6-cijferige 2FA code in uit uw authenticator app.";
         } else {
             $stmt = $db->prepare("SELECT * FROM users WHERE id = ?");
@@ -120,8 +140,10 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             }
 
             if ($isValid) {
+                fociz_clear_rate_limit($totpRateKey);
+                fociz_clear_rate_limit($ipRateKey);
+
                 // Volledige login succesvol (geldig tot 23:59:59 van vandaag)
-                $clientIp = fociz_get_client_ip();
                 fociz_register_user_ip((int)$user['id'], $clientIp, true);
 
                 $_SESSION['user_id'] = $user['id'];
@@ -142,6 +164,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                 header('Location: /planner.php');
                 exit;
             } else {
+                fociz_hit_rate_limit($totpRateKey, 900);
+                fociz_hit_rate_limit($ipRateKey, 900);
                 $error = "Onjuiste 2FA code. Controleer uw authenticator app en probeer opnieuw.";
             }
         }
@@ -229,6 +253,7 @@ $pageTitle = "Fociz — Inloggen";
     <?php if ($step === 1): ?>
         <!-- STAP 1: E-mail & Wachtwoord -->
         <form method="POST" action="/auth/login.php" class="space-y-4">
+            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
             <div>
                 <label class="block text-xs font-semibold text-slate-700 dark:text-slate-300 mb-1">E-mailadres</label>
                 <div class="relative">
@@ -256,6 +281,7 @@ $pageTitle = "Fociz — Inloggen";
 
         <!-- STAP 2: 2FA TOTP Code -->
         <form method="POST" action="/auth/login.php" class="space-y-5">
+            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
             <div class="text-center">
                 <div class="inline-flex items-center justify-center w-12 h-12 rounded-xl bg-indigo-50 dark:bg-indigo-950/40 text-indigo-600 dark:text-indigo-400 mb-2">
                     <i data-lucide="key" class="w-6 h-6"></i>

auth/setup.php

@@ -214,7 +214,7 @@ $pageTitle = "Fociz — Eerste Initialisatie";
                 </p>
 
                 <div class="inline-block p-3 bg-white rounded-2xl shadow-xs border border-slate-200 dark:border-slate-800">
-                    <img src="<?= htmlspecialchars($qrCodeUrl) ?>" alt="2FA QR Code" class="w-44 h-44 mx-auto">
+                    <div id="qrcode" class="w-44 h-44 mx-auto flex items-center justify-center"></div>
                 </div>
 
                 <div class="bg-slate-50 dark:bg-[#0c0f17] border border-slate-200 dark:border-slate-800 rounded-xl p-2.5 text-xs text-slate-600 dark:text-slate-400 max-w-sm mx-auto font-mono flex items-center justify-between">
@@ -238,8 +238,20 @@ $pageTitle = "Fociz — Eerste Initialisatie";
     <?php endif; ?>
 </div>
 
+<script src="/assets/js/qrcode.min.js"></script>
 <script>
     if (typeof lucide !== 'undefined') lucide.createIcons();
+    const qrContainer = document.getElementById('qrcode');
+    if (qrContainer) {
+        new QRCode(qrContainer, {
+            text: <?= json_encode($otpAuthUrl) ?>,
+            width: 176,
+            height: 176,
+            colorDark: '#000000',
+            colorLight: '#ffffff',
+            correctLevel: QRCode.CorrectLevel.M
+        });
+    }
 </script>
 </body>
 </html>

config/config.php

@@ -17,6 +17,7 @@ if (!headers_sent()) {
     header('X-XSS-Protection: 1; mode=block');
     header('Referrer-Policy: strict-origin-when-cross-origin');
     header('Permissions-Policy: camera=(), microphone=(), geolocation=()');
+    header("Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.tailwindcss.com https://unpkg.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' data: https://fonts.gstatic.com; img-src 'self' data: https:; connect-src 'self'; frame-ancestors 'self'; base-uri 'self'; form-action 'self'");
     if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') {
         header('Strict-Transport-Security: max-age=31536000; includeSubDomains');
     }
@@ -100,7 +101,7 @@ define('DB_HOST', fociz_env('DB_HOST', '192.168.2.33'));
 define('DB_PORT', fociz_env('DB_PORT', '3306'));
 define('DB_NAME', fociz_env('DB_NAME', $isDevEnv ? 'focizdev' : 'fociz'));
 define('DB_USER', fociz_env('DB_USER', $isDevEnv ? 'focizdev_user' : 'focizlive_user'));
-define('DB_PASS', fociz_env('DB_PASS', $isDevEnv ? 'F0c1z_Dev_Secure_2026!' : 'F0c1z_Live_Secure_2026!'));
+define('DB_PASS', fociz_env('DB_PASS', ''));
 define('DB_CHARSET', 'utf8mb4');
 
 // Bepaal de dynamische of geconfigureerde applicatie URL
@@ -137,7 +138,7 @@ date_default_timezone_set('Europe/Amsterdam');
 define('SMTP_HOST', fociz_env('SMTP_HOST', 'mail.fociz.nl'));
 define('SMTP_PORT', (int)fociz_env('SMTP_PORT', 587));
 define('SMTP_USER', fociz_env('SMTP_USER', 'info@fociz.nl'));
-define('SMTP_PASS', fociz_env('SMTP_PASS', '6swpQSBg5uWFmjar7F6a'));
+define('SMTP_PASS', fociz_env('SMTP_PASS', ''));
 define('SMTP_SECURE', fociz_env('SMTP_SECURE', 'tls')); // 'tls' (STARTTLS port 587) of 'ssl' (port 465)
 define('SMTP_FROM_EMAIL', fociz_env('SMTP_FROM_EMAIL', 'info@fociz.nl'));
 define('SMTP_FROM_NAME', fociz_env('SMTP_FROM_NAME', 'Fociz'));
@@ -156,10 +157,7 @@ if (APP_ENV === 'live') {
         $error = error_get_last();
         if ($error && in_array($error['type'], [E_ERROR, E_CORE_ERROR, E_COMPILE_ERROR, E_PARSE])) {
             error_log("Fociz Fatal Error: [{$error['type']}] {$error['message']} in {$error['file']}:{$error['line']}");
-            $showDiagnostics = (
+            $showDiagnostics = (isset($_SESSION['user_role']) && $_SESSION['user_role'] === 'ADMIN');
-                (isset($_SESSION['user_role']) && $_SESSION['user_role'] === 'ADMIN') ||
-                (isset($_GET['debug']) && $_GET['debug'] === 'fociz')
-            );
             if ($showDiagnostics) {
                 echo "<div style='font-family: monospace; background: #0c0f17; color: #ef4444; padding: 25px; margin: 20px; border-radius: 12px; border: 1px solid #dc2626;'>
                     <h3>⚠️ Fociz Systeemfout (Diagnostiek)</h3>

includes/.htaccess

@@ -0,0 +1,9 @@
+# Beveiliging van de interne includes map (Pen Test Beveiliging)
+<IfModule authz_core_module>
+    Require all denied
+</IfModule>
+<IfModule !authz_core_module>
+    Order deny,allow
+    Deny from all
+</IfModule>
+

includes/auth.php

@@ -568,6 +568,55 @@ function verify_csrf_token(?string $token): bool {
     return !empty($token) && !empty($_SESSION['csrf_token']) && hash_equals($_SESSION['csrf_token'], $token);
 }
 
+/**
+ * Rate limiting helpers via app_cache
+ */
+function fociz_check_rate_limit(string $actionKey, int $maxAttempts = 5, int $decaySeconds = 900): array {
+    require_once __DIR__ . '/cache.php';
+    $cacheKey = 'rl_' . hash('sha256', $actionKey);
+    $data = fociz_cache_get($cacheKey);
+
+    $attempts = 0;
+    $expiresAt = time() + $decaySeconds;
+    if (is_array($data)) {
+        $attempts = (int)($data['attempts'] ?? 0);
+        $expiresAt = (int)($data['expires_at'] ?? $expiresAt);
+    }
+
+    $allowed = ($attempts < $maxAttempts);
+    $remaining = max(0, $maxAttempts - $attempts);
+    $retryAfter = max(0, $expiresAt - time());
+
+    return [
+        'allowed'     => $allowed,
+        'remaining'   => $remaining,
+        'retry_after' => $retryAfter,
+        'attempts'    => $attempts
+    ];
+}
+
+function fociz_hit_rate_limit(string $actionKey, int $decaySeconds = 900): void {
+    require_once __DIR__ . '/cache.php';
+    $cacheKey = 'rl_' . hash('sha256', $actionKey);
+    $data = fociz_cache_get($cacheKey);
+
+    $attempts = 1;
+    $expiresAt = time() + $decaySeconds;
+    if (is_array($data)) {
+        $attempts = (int)($data['attempts'] ?? 0) + 1;
+        $expiresAt = (int)($data['expires_at'] ?? $expiresAt);
+    }
+
+    $ttl = max(1, $expiresAt - time());
+    fociz_cache_set($cacheKey, ['attempts' => $attempts, 'expires_at' => $expiresAt], $ttl);
+}
+
+function fociz_clear_rate_limit(string $actionKey): void {
+    require_once __DIR__ . '/cache.php';
+    $cacheKey = 'rl_' . hash('sha256', $actionKey);
+    fociz_cache_delete($cacheKey);
+}
+
 /**
  * Genereert een cryptografisch ondertekende OAuth state parameter waarin de user_id en timestamp veilig zijn opgeslagen.
  * Dit voorkomt CSRF en maakt sessieherstel mogelijk bij cross-site OAuth redirects.

includes/integrations/jira.php

@@ -9,14 +9,41 @@ require_once __DIR__ . '/../../config/database.php';
 require_once __DIR__ . '/../cache.php';
 
 /**
- * Normaliseert het Jira domein naar een schone URL zonder slash aan het einde
+ * Normaliseert het Jira domein naar een schone URL zonder slash aan het einde.
+ * Bevat SSRF-bescherming: weigert loopbacks, localhost en private netwerkadressen.
  */
 function jira_normalize_domain(string $domain): string {
     $domain = trim($domain);
+    if (empty($domain)) {
+        return '';
+    }
+
     if (!preg_match('#^https?://#i', $domain)) {
         $domain = 'https://' . $domain;
     }
-    return rtrim($domain, '/');
+    $domain = rtrim($domain, '/');
+
+    // Parseer en valideer de host ter voorkoming van SSRF (Server-Side Request Forgery)
+    $parsed = parse_url($domain);
+    $host = $parsed['host'] ?? '';
+    if (empty($host)) {
+        return '';
+    }
+
+    $lowerHost = strtolower($host);
+    // Weiger localhost en local domains
+    if ($lowerHost === 'localhost' || str_ends_with($lowerHost, '.localhost') || str_ends_with($lowerHost, '.local') || str_ends_with($lowerHost, '.internal')) {
+        return '';
+    }
+
+    // Weiger private IP-ranges en loopback adressen (bijv. 127.0.0.1, 192.168.x, 10.x, 172.16.x, 169.254.x)
+    if (filter_var($host, FILTER_VALIDATE_IP)) {
+        if (!filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
+            return '';
+        }
+    }
+
+    return $domain;
 }
 
 /**

includes/mailer.php

@@ -35,15 +35,26 @@ class FocizMailer {
             $logs[] = date('H:i:s') . ' ' . $msg;
         };
 
+        // Saniteer e-mailadressen en headers tegen CRLF en SMTP command injection
+        $toEmail   = str_replace(["\r", "\n", "\0"], '', trim($toEmail));
+        $toName    = str_replace(["\r", "\n", "\0"], '', trim($toName));
+        $subject   = str_replace(["\r", "\n", "\0"], '', trim($subject));
+
+        if (!filter_var($toEmail, FILTER_VALIDATE_EMAIL)) {
+            $err = "Ongeldig e-mailadres voor verzending: {$toEmail}";
+            $log("FOUT: {$err}");
+            return ['success' => false, 'error' => $err, 'logs' => $logs];
+        }
+
         // 1. Configuratieparameters ophalen
         $host       = $options['host'] ?? (defined('SMTP_HOST') ? SMTP_HOST : 'mail.fociz.nl');
         $port       = (int)($options['port'] ?? (defined('SMTP_PORT') ? SMTP_PORT : 587));
         $username   = $options['username'] ?? (defined('SMTP_USER') ? SMTP_USER : 'info@fociz.nl');
         $password   = $options['password'] ?? (defined('SMTP_PASS') ? SMTP_PASS : '');
         $secure     = strtolower($options['secure'] ?? (defined('SMTP_SECURE') ? SMTP_SECURE : 'tls'));
-        $fromEmail  = $options['from_email'] ?? (defined('SMTP_FROM_EMAIL') ? SMTP_FROM_EMAIL : 'no-reply@fociz.nl');
+        $fromEmail  = str_replace(["\r", "\n", "\0"], '', trim($options['from_email'] ?? (defined('SMTP_FROM_EMAIL') ? SMTP_FROM_EMAIL : 'no-reply@fociz.nl')));
-        $fromName   = $options['from_name'] ?? (defined('SMTP_FROM_NAME') ? SMTP_FROM_NAME : 'Fociz');
+        $fromName   = str_replace(["\r", "\n", "\0"], '', trim($options['from_name'] ?? (defined('SMTP_FROM_NAME') ? SMTP_FROM_NAME : 'Fociz')));
-        $replyTo    = $options['reply_to'] ?? (defined('SMTP_REPLY_TO') ? SMTP_REPLY_TO : 'info@fociz.nl');
+        $replyTo    = str_replace(["\r", "\n", "\0"], '', trim($options['reply_to'] ?? (defined('SMTP_REPLY_TO') ? SMTP_REPLY_TO : 'info@fociz.nl')));
         $timeout    = (int)($options['timeout'] ?? 15);
 
         // Technische afzender voor de SMTP envelope (moet doorgaans overeenkomen met het geauthenticeerde account)

includes/settings.php

@@ -110,7 +110,14 @@ function get_workday_settings(): array {
  */
 function get_ai_settings(): array {
     $envKey = fociz_env('OPENAI_API_KEY', '');
-    $savedKey = get_system_setting('ai_api_key', '');
+    $savedKeyRaw = get_system_setting('ai_api_key', '');
+    $savedKey = '';
+    if (!empty($savedKeyRaw)) {
+        if (!function_exists('fociz_decrypt')) {
+            require_once __DIR__ . '/auth.php';
+        }
+        $savedKey = fociz_decrypt($savedKeyRaw);
+    }
     $apiKey = !empty($savedKey) ? $savedKey : $envKey;
 
     return [

includes/totp.php

@@ -107,14 +107,12 @@ class TOTP {
     }
 
     /**
-     * Genereert een QR code afbeelding URL (via QuickChart HTTPS)
+     * Genereert een veilige client-side QR code (geen externe API calls meer ter bescherming van TOTP secrets)
      */
     public static function getQrCodeUrl(string $otpAuthUrl, int $size = 220): string {
-        return sprintf(
+        // Externe API (quickchart.io) verwijderd om te voorkomen dat 2FA secrets uitlekken naar derden.
-            'https://quickchart.io/qr?text=%s&size=%d&margin=1&ecLevel=M',
+        // QR rendering gebeurt nu 100% lokaal via /assets/js/qrcode.min.js in de browser.
-            urlencode($otpAuthUrl),
+        return '';
-            $size
-        );
     }
 
     /**

profile.php

@@ -25,6 +25,10 @@ if (!empty($_GET['success'])) {
 
 // POST Verwerking VÓÓR headers zodat redirects en mutaties soepel verlopen
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    if (!verify_csrf_token($_POST['csrf_token'] ?? null)) {
+        $message = "Beveiligingsfout: CSRF-token ongeldig of verlopen. Ververs de pagina en probeer opnieuw.";
+        $messageType = 'error';
+    } else {
         $action = $_POST['action'] ?? '';
 
     // 1. Outlook koppelen via OAuth
@@ -79,7 +83,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $existingSettings = json_decode($existing['settings'] ?? '{}', true) ?: [];
 
         if (($jiraToken === '' || $jiraToken === '••••••••••••••••') && !empty($existingSettings['jira_api_token']) && $existingSettings['jira_api_token'] !== '••••••••••••••••') {
-            $jiraToken = $existingSettings['jira_api_token'];
+            $jiraToken = fociz_decrypt($existingSettings['jira_api_token']);
         }
 
         $accountName = $existingSettings['account_name'] ?? '';
@@ -104,7 +108,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $newSettings = [
             'jira_domain'    => $jiraDomain,
             'jira_email'     => $jiraEmail,
-            'jira_api_token' => $jiraToken,
+            'jira_api_token' => fociz_encrypt($jiraToken),
             'account_name'   => $accountName,
             'account_id'     => $accountId,
         ];
@@ -266,6 +270,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $messageType = 'success';
     }
     }
+}
 
 // Actuele gegevens ophalen
 $stmtUser = $db->prepare("SELECT * FROM users WHERE id = ?");
@@ -524,6 +529,7 @@ require_once __DIR__ . '/includes/header.php';
             <?php if (!empty($userProfile['avatar_url'])): ?>
             <form method="POST" action="/profile.php" class="self-start sm:self-auto">
                 <input type="hidden" name="action" value="remove_avatar">
+                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
                 <button type="submit" onclick="return confirm('Avatar herstellen naar standaard initiaal-badge?')" class="inline-flex items-center space-x-1.5 px-3 py-1.5 rounded-xl text-xs font-semibold text-rose-600 dark:text-rose-400 bg-rose-50 dark:bg-rose-950/30 border border-rose-200 dark:border-rose-800/50 hover:bg-rose-100 dark:hover:bg-rose-900/50 transition cursor-pointer">
                     <i data-lucide="rotate-ccw" class="w-3.5 h-3.5"></i>
                     <span>Standaard Herstellen</span>
@@ -532,61 +538,51 @@ require_once __DIR__ . '/includes/header.php';
             <?php endif; ?>
         </div>
 
-        <div class="grid grid-cols-1 lg:grid-cols-12 gap-6">
+        <!-- Avatar Selector Grid & Upload -->
-            <!-- Linker kolom: 24 Standaard Preset Avatars (8 cols) -->
+        <div class="mt-6 grid grid-cols-1 lg:grid-cols-12 gap-6 items-start">
-            <div class="lg:col-span-8 space-y-3">
+            <!-- Linker kolom: 24 mini karakters in grid (8 cols) -->
-                <div class="flex flex-col sm:flex-row sm:items-center justify-between gap-2">
+            <div class="lg:col-span-8 space-y-4">
+                <div class="flex items-center justify-between">
                     <h3 class="text-xs font-bold text-slate-800 dark:text-slate-200 flex items-center space-x-1.5">
                         <i data-lucide="sparkles" class="w-3.5 h-3.5 text-indigo-500"></i>
-                        <span>Kies een Karakter (24 Flitsende Avatars)</span>
+                        <span>Kies een Karakter (24 Stijlen)</span>
                     </h3>
-                    <span class="text-[11px] text-slate-400 dark:text-slate-500">Klik om direct toe te passen</span>
+
+                    <!-- Categorie Filters -->
+                    <div class="flex items-center space-x-1 bg-slate-100 dark:bg-[#0c0f17] p-1 rounded-xl border border-slate-200 dark:border-slate-800 text-[11px]" id="avatarFilterBar">
+                        <button type="button" onclick="filterAvatars('all')" class="avatar-filter-btn active px-2.5 py-1 rounded-lg font-medium transition cursor-pointer" data-cat="all">Alles</button>
+                        <button type="button" onclick="filterAvatars('pro')" class="avatar-filter-btn px-2.5 py-1 rounded-lg font-medium transition text-slate-500 hover:text-slate-900 dark:text-slate-400 dark:hover:text-white cursor-pointer" data-cat="pro">Pro</button>
+                        <button type="button" onclick="filterAvatars('creative')" class="avatar-filter-btn px-2.5 py-1 rounded-lg font-medium transition text-slate-500 hover:text-slate-900 dark:text-slate-400 dark:hover:text-white cursor-pointer" data-cat="creative">Creatief</button>
+                        <button type="button" onclick="filterAvatars('tech')" class="avatar-filter-btn px-2.5 py-1 rounded-lg font-medium transition text-slate-500 hover:text-slate-900 dark:text-slate-400 dark:hover:text-white cursor-pointer" data-cat="tech">Tech</button>
+                        <button type="button" onclick="filterAvatars('heroes')" class="avatar-filter-btn px-2.5 py-1 rounded-lg font-medium transition text-slate-500 hover:text-slate-900 dark:text-slate-400 dark:hover:text-white cursor-pointer" data-cat="heroes">Heroes</button>
+                    </div>
                 </div>
 
-                <!-- Categorie Filter Pills -->
+                <div class="grid grid-cols-4 sm:grid-cols-6 md:grid-cols-8 gap-2.5 p-3 rounded-2xl bg-slate-50/70 dark:bg-[#0c0f17]/60 border border-slate-200 dark:border-slate-800" id="avatarGrid">
-                <div class="flex flex-wrap items-center gap-1.5 pt-1">
-                    <button type="button" onclick="filterAvatarCategory('all')" id="avCatBtn-all" class="av-cat-btn px-2.5 py-1 rounded-lg text-[11px] font-bold transition cursor-pointer bg-indigo-600 text-white shadow-xs">
-                        Alle (24)
-                    </button>
-                    <button type="button" onclick="filterAvatarCategory('emoji')" id="avCatBtn-emoji" class="av-cat-btn px-2.5 py-1 rounded-lg text-[11px] font-semibold transition cursor-pointer bg-slate-100 hover:bg-slate-200 dark:bg-slate-800 dark:hover:bg-slate-700 text-slate-700 dark:text-slate-300">
-                        ⚡ Fun & Emojis (6)
-                    </button>
-                    <button type="button" onclick="filterAvatarCategory('bots')" id="avCatBtn-bots" class="av-cat-btn px-2.5 py-1 rounded-lg text-[11px] font-semibold transition cursor-pointer bg-slate-100 hover:bg-slate-200 dark:bg-slate-800 dark:hover:bg-slate-700 text-slate-700 dark:text-slate-300">
-                        🤖 Cyber & Bots (6)
-                    </button>
-                    <button type="button" onclick="filterAvatarCategory('personas')" id="avCatBtn-personas" class="av-cat-btn px-2.5 py-1 rounded-lg text-[11px] font-semibold transition cursor-pointer bg-slate-100 hover:bg-slate-200 dark:bg-slate-800 dark:hover:bg-slate-700 text-slate-700 dark:text-slate-300">
-                        ✨ Moderne Personas (6)
-                    </button>
-                    <button type="button" onclick="filterAvatarCategory('heroes')" id="avCatBtn-heroes" class="av-cat-btn px-2.5 py-1 rounded-lg text-[11px] font-semibold transition cursor-pointer bg-slate-100 hover:bg-slate-200 dark:bg-slate-800 dark:hover:bg-slate-700 text-slate-700 dark:text-slate-300">
-                        🎯 Adventurer & Heroes (6)
-                    </button>
-                </div>
-
-                <div class="grid grid-cols-4 sm:grid-cols-6 md:grid-cols-8 gap-3 p-4 rounded-2xl bg-slate-50 dark:bg-[#0c0f17] border border-slate-200 dark:border-slate-800">
                     <?php 
                     $avatarPresets = [
-                        ['file' => 'avatar-01.svg', 'cat' => 'emoji', 'name' => 'Cool Star (Zonnebril)'],
+                        ['file' => 'avatar-01.svg', 'cat' => 'pro', 'name' => 'Alex (Business)'],
-                        ['file' => 'avatar-02.svg', 'cat' => 'emoji', 'name' => 'Party Champion'],
+                        ['file' => 'avatar-02.svg', 'cat' => 'pro', 'name' => 'Sophie (Corporate)'],
-                        ['file' => 'avatar-03.svg', 'cat' => 'emoji', 'name' => 'Celebration Vibe'],
+                        ['file' => 'avatar-03.svg', 'cat' => 'pro', 'name' => 'Liam (Consultant)'],
-                        ['file' => 'avatar-04.svg', 'cat' => 'emoji', 'name' => 'Laser Eyes Energy'],
+                        ['file' => 'avatar-04.svg', 'cat' => 'pro', 'name' => 'Emma (Manager)'],
-                        ['file' => 'avatar-05.svg', 'cat' => 'emoji', 'name' => 'Sunny Smiles'],
+                        ['file' => 'avatar-05.svg', 'cat' => 'pro', 'name' => 'Daan (Director)'],
-                        ['file' => 'avatar-06.svg', 'cat' => 'emoji', 'name' => 'Fire Heart'],
+                        ['file' => 'avatar-06.svg', 'cat' => 'pro', 'name' => 'Noa (Executive)'],
-                        ['file' => 'avatar-07.svg', 'cat' => 'bots', 'name' => 'Cyber Tron'],
+                        ['file' => 'avatar-07.svg', 'cat' => 'creative', 'name' => 'Mila (Designer)'],
-                        ['file' => 'avatar-08.svg', 'cat' => 'bots', 'name' => 'Aero Bot'],
+                        ['file' => 'avatar-08.svg', 'cat' => 'creative', 'name' => 'Lucas (Creator)'],
-                        ['file' => 'avatar-09.svg', 'cat' => 'bots', 'name' => 'Neon Volt'],
+                        ['file' => 'avatar-09.svg', 'cat' => 'creative', 'name' => 'Zara (Artist)'],
-                        ['file' => 'avatar-10.svg', 'cat' => 'bots', 'name' => 'Pixel Pulse'],
+                        ['file' => 'avatar-10.svg', 'cat' => 'creative', 'name' => 'Finn (Illustrator)'],
-                        ['file' => 'avatar-11.svg', 'cat' => 'bots', 'name' => 'Quantum AI'],
+                        ['file' => 'avatar-11.svg', 'cat' => 'creative', 'name' => 'Lotte (Writer)'],
-                        ['file' => 'avatar-12.svg', 'cat' => 'bots', 'name' => 'Robo Racer'],
+                        ['file' => 'avatar-12.svg', 'cat' => 'creative', 'name' => 'Sem (Architect)'],
-                        ['file' => 'avatar-13.svg', 'cat' => 'personas', 'name' => 'Alex (Hipster)'],
+                        ['file' => 'avatar-13.svg', 'cat' => 'tech', 'name' => 'Bram (Developer)'],
-                        ['file' => 'avatar-14.svg', 'cat' => 'personas', 'name' => 'Maya (Tech Lead)'],
+                        ['file' => 'avatar-14.svg', 'cat' => 'tech', 'name' => 'Julia (Engineer)'],
-                        ['file' => 'avatar-15.svg', 'cat' => 'personas', 'name' => 'Lucas (Designer)'],
+                        ['file' => 'avatar-15.svg', 'cat' => 'tech', 'name' => 'Jesse (DevOps)'],
-                        ['file' => 'avatar-16.svg', 'cat' => 'personas', 'name' => 'Elena (Developer)'],
+                        ['file' => 'avatar-16.svg', 'cat' => 'tech', 'name' => 'Tess (Data Scientist)'],
-                        ['file' => 'avatar-17.svg', 'cat' => 'personas', 'name' => 'Sam (Creative)'],
+                        ['file' => 'avatar-17.svg', 'cat' => 'tech', 'name' => 'Milan (Cyber Sec)'],
-                        ['file' => 'avatar-18.svg', 'cat' => 'personas', 'name' => 'Zoe (Founder)'],
+                        ['file' => 'avatar-18.svg', 'cat' => 'tech', 'name' => 'Liv (AI Engineer)'],
-                        ['file' => 'avatar-19.svg', 'cat' => 'heroes', 'name' => 'Jack (Adventurer)'],
+                        ['file' => 'avatar-19.svg', 'cat' => 'heroes', 'name' => 'Max (Ninja)'],
-                        ['file' => 'avatar-20.svg', 'cat' => 'heroes', 'name' => 'Luna (Heroine)'],
+                        ['file' => 'avatar-20.svg', 'cat' => 'heroes', 'name' => 'Sara (Astronaut)'],
-                        ['file' => 'avatar-21.svg', 'cat' => 'heroes', 'name' => 'Oliver (Explorer)'],
+                        ['file' => 'avatar-21.svg', 'cat' => 'heroes', 'name' => 'Robin (Pilot)'],
-                        ['file' => 'avatar-22.svg', 'cat' => 'heroes', 'name' => 'Mia (Rebel)'],
+                        ['file' => 'avatar-22.svg', 'cat' => 'heroes', 'name' => 'Eva (Explorer)'],
                         ['file' => 'avatar-23.svg', 'cat' => 'heroes', 'name' => 'Leo (Cosmic)'],
                         ['file' => 'avatar-24.svg', 'cat' => 'heroes', 'name' => 'Nova (Cyberpunk)'],
                     ];
@@ -597,6 +593,7 @@ require_once __DIR__ . '/includes/header.php';
                     ?>
                     <form method="POST" action="/profile.php" class="relative group avatar-item" data-category="<?= $av['cat'] ?>">
                         <input type="hidden" name="action" value="select_preset_avatar">
+                        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
                         <input type="hidden" name="avatar_preset" value="<?= $avatarPath ?>">
                         <button type="submit" class="w-full aspect-square rounded-2xl p-1 transition-all duration-200 transform hover:scale-110 active:scale-95 hover:shadow-lg hover:shadow-indigo-500/25 focus:outline-none cursor-pointer <?= $isSelected ? 'ring-2 ring-indigo-600 dark:ring-indigo-400 bg-indigo-50 dark:bg-indigo-950/40 shadow-sm' : 'hover:bg-white dark:hover:bg-slate-800 border border-transparent' ?>" title="<?= htmlspecialchars($av['name']) ?>">
                             <img src="<?= $avatarPath ?>" alt="<?= htmlspecialchars($av['name']) ?>" class="w-full h-full rounded-xl object-contain pointer-events-none drop-shadow-xs">
@@ -620,6 +617,7 @@ require_once __DIR__ . '/includes/header.php';
 
                 <form method="POST" action="/profile.php" enctype="multipart/form-data" class="p-4 rounded-2xl bg-slate-50 dark:bg-[#0c0f17] border border-slate-200 dark:border-slate-800 space-y-4">
                     <input type="hidden" name="action" value="upload_custom_avatar">
+                    <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
                     <div class="text-center p-5 border-2 border-dashed border-slate-300 dark:border-slate-700 rounded-xl hover:border-indigo-500 dark:hover:border-indigo-400 transition bg-white dark:bg-[#111622]">
                         <div class="w-10 h-10 mx-auto mb-2 rounded-xl bg-indigo-50 dark:bg-indigo-950/40 text-indigo-600 dark:text-indigo-400 flex items-center justify-center">
@@ -674,6 +672,7 @@ require_once __DIR__ . '/includes/header.php';
                 </a>
                 <form method="POST" onsubmit="return confirm('Weet u zeker dat u uw Microsoft Outlook agenda wilt ontkoppelen?');">
                     <input type="hidden" name="action" value="disconnect_outlook">
+                    <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
                     <button type="submit" class="px-3 py-1.5 rounded-xl bg-rose-50 hover:bg-rose-100 dark:bg-rose-500/10 dark:hover:bg-rose-500/20 text-rose-600 dark:text-rose-400 border border-rose-200 dark:border-rose-500/20 text-xs font-medium transition cursor-pointer">
                         Ontkoppelen
                     </button>
@@ -703,6 +702,7 @@ require_once __DIR__ . '/includes/header.php';
 
             <form method="POST" class="mt-4 p-4 rounded-xl bg-slate-50/70 dark:bg-slate-900/60 border border-slate-200/80 dark:border-slate-800 flex flex-col sm:flex-row sm:items-center justify-between gap-4">
                 <input type="hidden" name="action" value="save_outlook_settings">
+                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
                 <div class="space-y-1">
                     <label for="sync_interval_seconds" class="text-xs font-bold text-slate-900 dark:text-white flex items-center space-x-1.5">
                         <i data-lucide="refresh-cw" class="w-3.5 h-3.5 text-sky-500"></i>
@@ -752,6 +752,7 @@ require_once __DIR__ . '/includes/header.php';
                 <div>
                     <form method="POST">
                         <input type="hidden" name="action" value="connect_outlook">
+                        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
                         <button type="submit" class="inline-flex items-center space-x-2 px-6 py-3 rounded-xl bg-indigo-600 hover:bg-indigo-500 text-white font-semibold text-xs transition shadow-xs cursor-pointer">
                             <i data-lucide="log-in" class="w-4 h-4"></i>
                             <span>Koppel Mijn Outlook Agenda</span>
@@ -802,6 +803,7 @@ require_once __DIR__ . '/includes/header.php';
             <?php if ($isJiraConnected): ?>
             <form method="POST" onsubmit="return confirm('Weet u zeker dat u Jira wilt ontkoppelen?');">
                 <input type="hidden" name="action" value="disconnect_jira">
+                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
                 <button type="submit" class="px-3 py-1.5 rounded-xl bg-rose-50 hover:bg-rose-100 dark:bg-rose-500/10 dark:hover:bg-rose-500/20 text-rose-600 dark:text-rose-400 border border-rose-200 dark:border-rose-500/20 text-xs font-medium transition cursor-pointer">
                     Jira Ontkoppelen
                 </button>
@@ -811,6 +813,7 @@ require_once __DIR__ . '/includes/header.php';
 
         <form method="POST" class="mt-6 space-y-4">
             <input type="hidden" name="action" value="save_jira">
+            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
             <div class="grid grid-cols-1 sm:grid-cols-2 gap-4">
                 <div>
@@ -840,7 +843,7 @@ require_once __DIR__ . '/includes/header.php';
                     </a>
                 </div>
                 <div class="relative">
-                    <input type="password" id="jiraApiTokenInput" name="jira_api_token" value="<?= !empty($jiraSettings['jira_api_token']) ? htmlspecialchars($jiraSettings['jira_api_token']) : '' ?>" placeholder="Plak hier uw Atlassian API token..." class="w-full bg-white dark:bg-slate-900/60 border border-slate-200 dark:border-slate-800 rounded-xl pl-3.5 pr-10 py-2.5 text-xs text-slate-900 dark:text-white placeholder-slate-400 dark:placeholder-slate-600 focus:outline-none focus:ring-1 focus:ring-indigo-500">
+                    <input type="password" id="jiraApiTokenInput" name="jira_api_token" value="<?= !empty($jiraSettings['jira_api_token']) ? '••••••••••••••••' : '' ?>" placeholder="Plak hier uw Atlassian API token..." class="w-full bg-white dark:bg-slate-900/60 border border-slate-200 dark:border-slate-800 rounded-xl pl-3.5 pr-10 py-2.5 text-xs text-slate-900 dark:text-white placeholder-slate-400 dark:placeholder-slate-600 focus:outline-none focus:ring-1 focus:ring-indigo-500">
                     <button type="button" onclick="toggleJiraToken()" id="toggleJiraTokenBtn" title="Toon / verberg token" class="absolute inset-y-0 right-0 pr-3 flex items-center text-slate-400 hover:text-slate-600 dark:hover:text-slate-300 cursor-pointer">
                         <i data-lucide="eye" class="w-4 h-4" id="eyeJiraIcon"></i>
                     </button>
@@ -912,6 +915,7 @@ require_once __DIR__ . '/includes/header.php';
 
             <form method="POST" class="space-y-4">
                 <input type="hidden" name="action" value="save_notifications">
+                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
                 <div class="flex items-center justify-between p-4 rounded-xl bg-slate-50/70 dark:bg-slate-900/60 border border-slate-200/80 dark:border-slate-800">
                     <div>
@@ -1021,6 +1025,7 @@ require_once __DIR__ . '/includes/header.php';
 
             <form method="POST" class="space-y-4">
                 <input type="hidden" name="action" value="update_profile">
+                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
                 <div>
                     <label class="block text-xs font-semibold text-slate-700 dark:text-slate-300 mb-1.5">
@@ -1054,6 +1059,7 @@ require_once __DIR__ . '/includes/header.php';
 
             <form method="POST" class="space-y-3">
                 <input type="hidden" name="action" value="change_password">
+                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
                 <div>
                     <label class="block text-xs font-semibold text-slate-700 dark:text-slate-300 mb-1">

users.php

@@ -13,8 +13,14 @@ $message = null;
 $generatedLink = null;
 $error = null;
 
-// Uitnodiging aanmaken
+// POST acties afhandelen met CSRF-bescherming
-if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['action'] === 'create_invite') {
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    $action = $_POST['action'] ?? '';
+    $csrfToken = $_POST['csrf_token'] ?? null;
+
+    if (!verify_csrf_token($csrfToken)) {
+        $error = "Beveiligingsfout: CSRF-token ongeldig of verlopen. Ververs de pagina en probeer opnieuw.";
+    } elseif ($action === 'create_invite') {
         $email = strtolower(trim($_POST['email'] ?? ''));
         $role = in_array($_POST['role'] ?? '', ['ADMIN', 'MEMBER']) ? $_POST['role'] : 'MEMBER';
 
@@ -40,11 +46,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['
                 }
             }
         }
-}
+    } elseif ($action === 'resend_invite') {
-
+        $inviteId = (int)($_POST['invite_id'] ?? 0);
-// Uitnodiging opnieuw verzenden per e-mail
-if (isset($_GET['resend_invite'])) {
-    $inviteId = (int)$_GET['resend_invite'];
         $stmtInv = $db->prepare("SELECT * FROM invites WHERE id = ? AND used_at IS NULL AND expires_at > NOW()");
         $stmtInv->execute([$inviteId]);
         $inv = $stmtInv->fetch();
@@ -60,20 +63,14 @@ if (isset($_GET['resend_invite'])) {
         } else {
             $error = "Uitnodiging niet gevonden of reeds verlopen/geactiveerd.";
         }
-}
+    } elseif ($action === 'delete_invite') {
-
+        $inviteId = (int)($_POST['invite_id'] ?? 0);
-// Uitnodiging intrekken
-if (isset($_GET['delete_invite'])) {
-    $inviteId = (int)$_GET['delete_invite'];
         $stmtDel = $db->prepare("DELETE FROM invites WHERE id = ?");
         $stmtDel->execute([$inviteId]);
         header('Location: /users.php');
         exit;
-}
+    } elseif ($action === 'delete_user') {
-
+        $delUserId = (int)($_POST['user_id'] ?? 0);
-// Gebruiker verwijderen
-if (isset($_GET['delete_user'])) {
-    $delUserId = (int)$_GET['delete_user'];
         if ($delUserId !== (int)$adminUser['id']) {
             $stmtDelUser = $db->prepare("DELETE FROM users WHERE id = ?");
             $stmtDelUser->execute([$delUserId]);
@@ -81,6 +78,7 @@ if (isset($_GET['delete_user'])) {
         header('Location: /users.php');
         exit;
     }
+}
 
 // Haal alle gebruikers op
 $users = [];
@@ -158,6 +156,7 @@ require_once __DIR__ . '/includes/header.php';
 
         <form method="POST" action="/users.php" class="grid grid-cols-1 md:grid-cols-12 gap-3 items-end">
             <input type="hidden" name="action" value="create_invite">
+            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
 
             <div class="md:col-span-6">
                 <label class="block text-xs font-semibold text-slate-700 dark:text-slate-300 mb-1">E-mailadres van collega</label>
@@ -237,9 +236,14 @@ require_once __DIR__ . '/includes/header.php';
                             </td>
                             <td class="p-3 text-right">
                                 <?php if ($u['id'] !== $adminUser['id']): ?>
-                                    <a href="/users.php?delete_user=<?= $u['id'] ?>" onclick="return confirm('Gebruiker verwijderen?')" class="text-slate-400 hover:text-red-600 dark:text-slate-500 dark:hover:text-red-400 transition p-1 cursor-pointer">
+                                    <form method="POST" action="/users.php" class="inline" onsubmit="return confirm('Weet u zeker dat u deze gebruiker wilt verwijderen?')">
+                                        <input type="hidden" name="action" value="delete_user">
+                                        <input type="hidden" name="user_id" value="<?= (int)$u['id'] ?>">
+                                        <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
+                                        <button type="submit" title="Gebruiker verwijderen" class="text-slate-400 hover:text-red-600 dark:text-slate-500 dark:hover:text-red-400 transition p-1 cursor-pointer bg-transparent border-0">
                                             <i data-lucide="trash-2" class="w-4 h-4 inline"></i>
-                                    </a>
+                                        </button>
+                                    </form>
                                 <?php else: ?>
                                     <span class="text-[10px] text-slate-400 dark:text-slate-600 font-medium">Uzelf</span>
                                 <?php endif; ?>
@@ -295,14 +299,24 @@ require_once __DIR__ . '/includes/header.php';
                                 <td class="p-3 text-right">
                                     <div class="flex items-center justify-end space-x-2">
                                         <?php if (!$isUsed && !$isExpired): ?>
-                                            <a href="/users.php?resend_invite=<?= $inv['id'] ?>" title="Uitnodigingsmail opnieuw verzenden" class="inline-flex items-center space-x-1 px-2 py-1 bg-indigo-50 hover:bg-indigo-100 dark:bg-indigo-950/40 dark:hover:bg-indigo-900/60 text-indigo-600 dark:text-indigo-400 rounded-lg text-[11px] font-medium transition cursor-pointer">
+                                            <form method="POST" action="/users.php" class="inline">
+                                                <input type="hidden" name="action" value="resend_invite">
+                                                <input type="hidden" name="invite_id" value="<?= (int)$inv['id'] ?>">
+                                                <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
+                                                <button type="submit" title="Uitnodigingsmail opnieuw verzenden" class="inline-flex items-center space-x-1 px-2 py-1 bg-indigo-50 hover:bg-indigo-100 dark:bg-indigo-950/40 dark:hover:bg-indigo-900/60 text-indigo-600 dark:text-indigo-400 rounded-lg text-[11px] font-medium transition cursor-pointer border-0">
                                                     <i data-lucide="mail" class="w-3.5 h-3.5"></i>
                                                     <span>Opnieuw mailen</span>
-                                            </a>
+                                                </button>
+                                            </form>
                                         <?php endif; ?>
-                                        <a href="/users.php?delete_invite=<?= $inv['id'] ?>" onclick="return confirm('Uitnodiging intrekken?')" title="Uitnodiging intrekken" class="text-slate-400 hover:text-red-600 dark:text-slate-500 dark:hover:text-red-400 transition p-1 cursor-pointer">
+                                        <form method="POST" action="/users.php" class="inline" onsubmit="return confirm('Weet u zeker dat u deze uitnodiging wilt intrekken?')">
+                                            <input type="hidden" name="action" value="delete_invite">
+                                            <input type="hidden" name="invite_id" value="<?= (int)$inv['id'] ?>">
+                                            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars(get_csrf_token()) ?>">
+                                            <button type="submit" title="Uitnodiging intrekken" class="text-slate-400 hover:text-red-600 dark:text-slate-500 dark:hover:text-red-400 transition p-1 cursor-pointer bg-transparent border-0">
                                                 <i data-lucide="trash-2" class="w-4 h-4 inline"></i>
-                                        </a>
+                                            </button>
+                                        </form>
                                     </div>
                                 </td>
                             </tr>