What is CVE-2026-66399?

CVE-2026-66399 is a medium-severity vulnerability in Thorsten Phpmyfaq, classified under Improper Privilege Management. CVSS score: 6.5/10. Published 2026-07-27.

How severe is CVE-2026-66399?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Privilege escalation in Thorsten Phpmyfaq

CVE-2026-66399

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. At…

Vulnerability class: Privilege Escalation

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.

Affected products

Thorsten Phpmyfaq — versions 0, 4.1.6

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-66399?: CVE-2026-66399 is a medium-severity vulnerability in Thorsten Phpmyfaq, classified under Improper Privilege Management. CVSS score: 6.5/10. Published 2026-07-27.
How severe is CVE-2026-66399?: Medium severity. CVSS v3 base score is 6.5 out of 10.