GHSA-V348-VR4Q-FV9P TYPO3 sf_register extension allows unauthorized assignment of frontend user groups

The create and edit flows in the TYPO3 extension sfregister do not restrict which user properties may be submitted, and do not enforce access control on the frontend user group assignment. As a result, an attacker can assign an arbitrary frontend user group to a newly registered or edited account...

TYPO3-EXT-SA-2026-009: Broken Access Control in extension "Frontend User Registration" (sf_register)

More info at https://typo3.org/security/advisory/typo3-ext-sa-2026-009...