Privilege Escalation in phpMyFAQ Affects Administrative Group Management
CVE-2026-66399

8.5HIGH

Key Information:

Vendor

Thorsten

Status
pHPMyFAQ
Vendor
CVE Published:
27 July 2026

What is CVE-2026-66399?

The vulnerability in phpMyFAQ versions prior to 4.1.6 allows administrators with limited group-management permissions to join privileged groups without proper checks. This oversight enables attackers to manipulate their group memberships, thus inheriting unauthorized user-management rights and granting them potential access to modify or delete user accounts within the system. This abnormal behavior poses a significant risk to user data integrity and overall system security.

Affected Version(s)

phpMyFAQ 0 < 4.1.6

phpMyFAQ 4.1.6

References

https://github.com/thorsten/phpMyFAQ/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/phpmyfaq-before-priv...
third-party-advisory

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

geo-chen
.