CVE-2026-66399 HIGH

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

Vendor Thorsten
Product phpMyFAQ
Weakness CWE-269
Published July 27, 2026
Last update July 28, 2026

CVSS base score

8.5/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 27, 2026 CVE published
July 28, 2026 Record updated