CVE-2026-66399

thorsten phpMyFAQVulnerabilityCVSS 8.5

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.

No public exploitation has been reported so far. No distribution fix is listed yet; apply vendor mitigations and monitor.

Recommended action: Track your distribution's security tracker and apply the fix as soon as it ships.

CVE-2026-66399 thorsten phpMyFAQ Vulnerability

Severity metrics

CVSS 4.0 : 8.5 HIGH · CVSS 3.1 : 6.5 MEDIUM

Attack vectorNetwork (remote)

Attack complexityLow

Attack requirementsNone

Privileges requiredHigh

User interactionNone

Confidentiality impactHigh

Integrity impactHigh

Availability impactNone

Subsequent confidentialityNone

Subsequent integrityNone

Subsequent availabilityNone

Vector: AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Affected & fixed versions by distribution

Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.

No affected package in the tracked watchlist yet (Debian, Ubuntu, Arch, SUSE, Red Hat...). Triage may still be pending.

Sources

Advisory NVD CVE.org

Published 2026-07-27 · updated 2026-07-30 · source: NVD