CVE-2026-66399

MEDIUM 6.5

phpMyFAQ before 4.1.6 Privilege Escalation via Group Membership

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-269
Vendor	thorsten
Product	phpmyfaq
Published	Jul 27, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

thorsten / phpMyFAQ

0 < 4.1.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-28cc-v39j-vr95 vulncheck.com: https://www.vulncheck.com/advisories/phpmyfaq-before-privilege-escalation-via-group-membership

Credits

🔍 geo-chen