CVE-2026-66399: Thorsten Phpmyfaq

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

phpMyFAQ before 4.1.6 contains a privilege escalation vulnerability in GroupController::updateMembers() that allows administrators with only group-management permissions to join privileged groups without verification of required rights. Attackers can add themselves to pre-existing groups holding user-management rights and immediately inherit those permissions to modify or delete user accounts.

Affected products

• Thorsten Phpmyfaq: before 4.1.6 (fixed in 4.1.6)

Published 2026-07-27. Last modified 2026-07-28.