Vulnerability in TYPO3 Extension "Frontend User Registration"

[ Description ]Official description

The actions linked in the emails of the extension (e.g. to confirm a registration or the deletion of an account) do not reject requests with a missing or invalid hash. Instead, the frontend user given in the request is used. Unauthenticated attackers can therefore perform these actions for arbitrary active frontend users. This allows them to retrieve the email address or username of all frontend users and to delete arbitrary frontend user accounts.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund3 Nov 2026WID-SEC-2026-4322

  TYPO3 Extension (Mail): Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-120331CVE-2026-120330CVE-2026-120333+4 more CVEs

[ References ]References

• typo3.org/security/advisory/typo3-ext-sa-2026-038