Vulnerability · Published Jul 27, 2026 · Assigned by VulnCheck

CVE-2026-66399phpMyFAQ before 4.1.6 Privilege Escalation via Group Membership

Medium 6.5

In plain English

A medium-severity privilege mismanagement in phpMyFAQ from thorsten. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 78.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
thorsten	phpMyFAQ	0 – before 4.1.6

Weakness: CWE-269 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-28cc-v39j-vr95) vendor-advisory
VulnCheck Advisory: phpMyFAQ before 4.1.6 Privilege Escalation via Group Membership third-party-advisory