TYPO3 cms-form flaw allows security bypass
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CERT-FR advises a TYPO3 cms-form vulnerability before version 14.3.9 lets attackers bypass security policy; patch available.
CERT-FR issued an advisory regarding a security policy bypass vulnerability affecting the TYPO3 content management system, specifically the typo3/cms-form component in versions prior to 14.3.9. The vulnerability is tracked as CVE-2026-109162 and was disclosed by TYPO3 via GitHub security advisory GHSA-8p4x-mq38-6pg2 on 13 October 2026.
The advisory provides minimal technical detail, classifying the issue as a security policy bypass without further specifics on exploitation vector or in-the-wild activity. No indicators of compromise or evidence of active exploitation are mentioned. Defenders running TYPO3 with the cms-form extension should consult the official TYPO3 security bulletin and apply the patched version (14.3.9 or later) as soon as possible.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1296
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