CVE-2026-77143 — Broken Access Control in extension "Forum" (pforum)

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
TYPO3 / Extension "Forum"	affected 6.0.0 before 6.2.4; affected 5.0.0 before 5.0.1; affected 0 before 4.0.4

CWE

CWE-862, CWE-639

References

https://typo3.org/security/advisory/typo3-ext-sa-2026-021

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.