diff --git a/php/controller/showArticle-controller.php b/php/controller/showArticle-controller.php
index 6e140f9..6c1e929 100644
--- a/php/controller/showArticle-controller.php
+++ b/php/controller/showArticle-controller.php
@@ -25,6 +25,14 @@ if (isset($_GET["id"]) && !empty($_GET["id"])){
             exit();
         }
 
+        if($_GET["pfad"] == "updateArticle"){
+            if($article->getAuthor() != $_SESSION["user"]){
+                $_SESSION["message"] = "unauthorized_access";
+                header("location: ../../index.php");
+                exit();
+            }
+        }
+
         $commentManager = CommentManager::getInstance();
         $comments = $commentManager->getCommentsByArticle($_GET["id"]);