TI-2026-53886 Aliases CVE-2026-77143 GHSA-7mp3-wcqf-gf22

Broken Access Control in extension "Forum" (pforum)

MEDIUM 44CWE-639Published 2026-08-25 · Updated 2026-08-26

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: Low · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00406 35th percentileScored 2026-11-07

Fix Fixed Extension "Forum" (TYPO3): 6.2.4, 5.0.1, 4.0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
TYPO3	Extension "Forum"	6.0.0 to before 6.2.4; 5.0.0 to before 5.0.1; before 4.0.4	6.2.4, 5.0.1, 4.0.4	Patch available	CNA

Extension "Forum" VendorTYPO3 Affected 6.0.0 to before 6.2.4; 5.0.0 to before 5.0.1; before 4.0.4 Fixed in 6.2.4, 5.0.1, 4.0.4 Patch available CNA

Remediation

Fix · CNA Extension "Forum" (TYPO3) Fixed in 6.2.4, 5.0.1, 4.0.4

Timeline

2026-10-02 Threatist record created from CVE-2026-77143
2026-10-03 Alias added: GHSA-7mp3-wcqf-gf22

References

Advisory 1

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

TI-2023-10314 Persisted Cross-Site Scripting in Frontend Rendering in typo3 CVSS 3.1HIGH 8.8
TI-2010-03538 The jumpUrl (aka access tracking) implementation in tslib/class.tslib_fe.php in TYPO3… CVSS 2.0HIGH 7.1
TI-2009-00775 The jumpUrl mechanism in class.tslib_fe.php in TYPO3 3.3.x through 3.8.x, 4.0 before… CVSS 2.0MEDIUM 5.0
TI-2025-30547 The sr_feuser_register extension through 12.4.8 for TYPO3 allows Remote Code Execution. CVSS 3.1CRITICAL 10.0
TI-2019-08867 The PharStreamWrapper (aka phar-stream-wrapper) package 2.x before 2.1.1 and 3.x before… CVSS 3.1CRITICAL 9.8
TI-2008-04019 Unspecified vulnerability in the TYPO3 Secure Directory (kw_secdir) extension before… CVSS 2.0HIGH 10.0

See all 411 →

Sources

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