CVE-2026-77143 Broken Access Control in extension "Forum" (pforum)
Attackers can overwrite public forum topic content by submitting unauthorized update requests, requiring no special privileges or configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77143?
CVE-2026-77143 is a high-severity missing authorization vulnerability in TYPO3 Extension "Forum", published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The frontend topic editing flow does not verify on the server side that the requesting visitor owns the topic being modified. As a result, a visitor who knows the identifier of a topic from the public forum can submit a modified update request for that topic directly and overwrite its content, without the application confirming ownership. Topic identifiers are visible in the public forum listing, and exploitation requires no privileged access or non-default configuration.
Which versions are affected by CVE-2026-77143?
How do I fix CVE-2026-77143?
No fix has been published for CVE-2026-77143 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-77143 being exploited?
There is no known exploitation of CVE-2026-77143 in the wild and no public exploit code.
Sources
Also known as GHSA-7mp3-wcqf-gf22.