What’s Vulnerable › Vulnerabilities
CVE-2026-77143: Broken Access Control in extension "Forum" (pforum)
- Severity: high (CVSS 8.8 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-25 · updated 2026-09-28
- Weakness: CWE-639
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.
Affected products
- TYPO3 Extension "Forum": from 6.0.0 before 6.2.4; from 5.0.0 before 5.0.1; before 4.0.4 — fixed in 4.0.4, 5.0.1, 6.2.4
How to fix
Upgrade to a fixed version: TYPO3 Extension "Forum" 4.0.4, 5.0.1, 6.2.4. Check the vendor advisory for mitigations.
References
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