From 682194d71a5f67fa39d899a9625ba69bb62f9bd8 Mon Sep 17 00:00:00 2001
From: Marcus Schwemer <marcus.schwemer@in2code.de>
Date: Wed, 11 Sep 2024 11:57:11 +0200
Subject: [PATCH] [SECURITY] Fix IDOR vulnerability in createAction

Please see TYPO3 Security Announcement for details.
---
 Classes/Controller/FormController.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Classes/Controller/FormController.php b/Classes/Controller/FormController.php
index d1a90d50a..3a61a024d 100644
--- a/Classes/Controller/FormController.php
+++ b/Classes/Controller/FormController.php
@@ -299,6 +299,9 @@ public function initializeCreateAction(): void
      */
     public function createAction(Mail $mail, string $hash = ''): ResponseInterface
     {
+        if ($mail->getUid() !== null && !HashUtility::isHashValid($hash, $mail)) {
+            return (new ForwardResponse('form'))->withoutArguments();
+        }
         $event = GeneralUtility::makeInstance(FormControllerCreateActionBeforeRenderViewEvent::class, $mail, $hash, $this);
         $this->eventDispatcher->dispatch($event);
         $mail = $event->getMail();