CVE-2026-66399

Description

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.

CVSS Vector

References

• https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-28cc-v39j-vr95
• https://www.vulncheck.com/advisories/phpmyfaq-before-privilege-escalation-via-group-membership