Vulnerability in TYPO3 CMS

[ Description ]Official description

Forms using FileUpload or ImageUpload elements with a custom saveToFileMount configured stored uploaded files in the default storage folder 1:/user_upload/ instead of the configured destination. This could cause uploaded files to end up in a publicly accessible storage even though a restricted, non-public storage had been configured. Files stored this way are served directly, without the access checks applied to non-public storages. Forms that use the default value for saveToFileMount are not affected. This issue affects TYPO3 CMS versions 14.0.0-14.3.8.

[ Fixes ]Fixes and patches

• Security bulletin: Typo3 GHSA-8p4x-mq38-6pg2Vendor patch or bulletin · CERT-FR · github.com/TYPO3/typo3/security/advisories/GHSA-8p4x-mq38-6pg2, cited by CERT-FR CERTFR-2026-AVI-1296

[ Advisories ]Government CERT advisories

• CERT-FR13 Oct 2026CERTFR-2026-AVI-1296

  Vulnerability in Typo3 Translated from French

  A vulnerability has been discovered in Typo3. It allows an attacker to cause a security policy bypass.

  CVE-2026-109162
• BSI CERT-Bund12 Oct 2026WID-SEC-2026-3880

  TYPO3 Core: Vulnerability allows bypassing security measures and information disclosure Translated from German

  CVE-2026-109162

[ References ]References

• github.com/TYPO3/typo3/commit/cc3e8e28b0e830aaf6ad857272f3f2dc3c4ede12
• github.com/TYPO3/typo3/commit/f536f75c6bd3456165e4200e5df1b236ddeae3b0
• news.typo3.com/security/advisory/typo3-core-sa-2026-024