---
title: "TYPO3 Exception 1392409507"
manual: "TYPO3 Exceptions"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3exceptions:typo3-exception-1392409507"
source: "Exceptions/1392409507.rst"
modified: "2026-09-16T07:39:08+00:00"
---

# TYPO3 Exception 1392409507

> [!NOTE]
> Below, the TYPO3 community may have provided additional information or
> solutions for this exception. However, these may or may not apply to your
> particular case. If you can provide more information, you should come back
> here and add your experience and solution steps to this issue once you have
> resolved it.
>
> General TYPO3 troubleshooting tips can be found in the *Troubleshooting*
> section in the menu. You can also ask questions and receive support in the
> [TYPO3 Questions category on talk.typo3.org](https://talk.typo3.org/c/typo3-questions/).
>
> To add your experience, click "Edit on GitHub" above and follow the
> ["Edit on GitHub" workflow](https://docs.typo3.org/m/typo3/docs-how-to-document/main/en-us/Howto/EditOnGithub.html#docs-contribute-github-method).
> Also check out
> [our tip on Coding Style and reST](https://docs.typo3.org/permalink/t3exceptions:tip-about-rest-coding-style).

## Invalid form/module token detected. Access Denied.

The problem is usually caused by an missing security token which
protects against
[CSRF](https://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29).
It can occur in the backend by clicking on an icon, link or using other
controls. This problem is usually only backend related but could also
occur in the frontend when using frontend editing.

**For TYPO3 integrators:**

If you encounter this problem with default backend modules included in
the TYPO3 distribution you should first check if there is already an
error report on [https://forge.typo3.org](https://forge.typo3.org) and if this is not the case feel
free to create a new bug report.

**For developers:**

See [https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/FormProtection/Index.html](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/FormProtection/Index.html)