diff --git a/php/controller/updateArticle-controller.php b/php/controller/updateArticle-controller.php
index cb58617..bc24544 100644
--- a/php/controller/updateArticle-controller.php
+++ b/php/controller/updateArticle-controller.php
@@ -8,6 +8,7 @@ require_once '../model/ArticleManager.php';
 require_once '../model/Article.php';
 require_once '../validator/article-validator.php';
 require_once '../../includes/article-block-helper.php';
+require_once '../../includes/csrf.php'; // NEU: CSRF-Schutz
 
 if (!isset($_SESSION["user"])) {
     header("Location: index.php?pfad=login");
@@ -16,9 +17,17 @@ if (!isset($_SESSION["user"])) {
 
 if ($_SERVER["REQUEST_METHOD"] === "POST") {
 
-    if (isset($_GET["id"]) && !empty($_GET["id"])) {
-        $id = $_GET["id"];
-    } else {
+    // CSRF-Token prüfen, bevor irgendeine Änderung vorgenommen wird
+    if (!csrf_verify()) {
+        $_SESSION["message"] = "invalid_csrf_token";
+        header("location: ../../index.php?pfad=updateArticle");
+        exit();
+    }
+
+    // Die Beitrags-ID muss eine gültige numerische ID sein
+    $id = filter_input(INPUT_GET, "id", FILTER_VALIDATE_INT);
+
+    if ($id === false || $id === null) {
         $_SESSION["message"] = "missing_id";
         header("location: ../../index.php?pfad=updateArticle");
         exit();
@@ -27,6 +36,14 @@ if ($_SERVER["REQUEST_METHOD"] === "POST") {
     try {
         $articleManager = ArticleManager::getInstance();
         $article = $articleManager->getArticle($id);
+
+        // Existenz des Beitrags prüfen, bevor auf $article zugegriffen wird.
+        if ($article === null) {
+            $_SESSION["message"] = "missing_id";
+            header("location: ../../index.php?pfad=updateArticle");
+            exit();
+        }
+
         if ($article->getAuthor() != $_SESSION["user_email"]) {
             $_SESSION["message"] = "unauthorized_access";
             header("location: ../../index.php");