---
title: "TYPO3-EXT-SA-2020-006: Broken Access Control in extension \"gForum\" (g_forum)"
url: "https://news.typo3.com/security/advisory/typo3-ext-sa-2020-006"
description: "It has been discovered that the extension \"gForum\" (g_forum) is susceptible to Broken Access Control."
image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg"
date: 2026-06-11
modified: 2026-06-11
categories:
  - "Developer & Technology"
  - TYPO3 Extensions
---

# TYPO3-EXT-SA-2020-006: Broken Access Control in extension "gForum" (g_forum)

- [Developer & Technology](https://news.typo3.com/article/category/developer-technology)
- Security / [TYPO3 Extensions](https://news.typo3.com/article/category/security/typo3-extensions)

TYPO3-EXT-SA-2020-006: Broken Access Control in extension "gForum" (g\_forum)
=============================================================================

12 May 2020

![A laptop screen displaying a list of security advisories](https://news.typo3.com/typo3temp/assets/_processed_/d/c/csm_security_blog_default_77f8e86036.webp)

It has been discovered that the extension "gForum" (g\_forum) is susceptible to Broken Access Control.

- ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/e4eaa13e33dd086a9c06f2570cb34609.jpeg)[Torben Hansen](https://news.typo3.com/article/author/torben-hansen)

- Release Date: May 12, 2020
- Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
- Component: gForum (ext:g\_forum)
- Vulnerability Type: Broken Access Control
- Affected Versions: 0.0.29 and below
- Severity: High
- Suggested CVSS v3.1: [AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:F/RL:U/RC:C](https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:F/RL:U/RC:C&version=3.1)
- References: None

### Problem Description

The extension fails to check access rights of authenticated frontend users allowing to create, edit and delete various records of the extension without proper permission.

### Solution

All versions of this extension that are known to be vulnerable will no longer be available for download from the TYPO3 Extension Repository, since the extension is abandoned and has no extension maintainer anymore.

Please uninstall and delete the extension folder from your installation and search on the [TYPO3 Extension Repository](https://extensions.typo3.org/) for alternative extensions.

### Credits

Thanks to TYPO3 security team member Torben Hansen for discovering and reporting the vulnerability.

### General Advice

Follow the recommendations that are given in the [TYPO3 Security Guide](https://docs.typo3.org/typo3cms/CoreApiReference/Security/Index.html#security-guidelines). Please subscribe to the [typo3-announce](http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce) mailing list.

![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/7cf52722a5b7183b29d378a2284bd103.jpeg)

About the Author

[Torben Hansen](https://news.typo3.com/article/author/torben-hansen)

Open Source Enthusiast & TYPO3 Expert

I’m a passionate open-source advocate and dedicated TYPO3 expert. As a freelancer, I offer professional TYPO3 services to clients while actively contributing to the TYPO3 ecosystem. I have developed several public TYPO3 extensions and serve as the Co-Lead of the TYPO3 Security Team, helping to enhance the platform’s security and functionality. For many years, I have been blogging about TYPO3, sharing insights and expertise with the community.

[More posts by this author](https://news.typo3.com/article/author/torben-hansen)