CVE-2026-66399 phpMyFAQ before 4.1.6 Privilege Escalation via Group Membership
Administrators with limited group-management permissions can escalate privileges by joining privileged groups, allowing them to modify or delete user accounts.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66399?
CVE-2026-66399 is a high-severity vulnerability in thorsten phpMyFAQ, published on 27 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
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.
Weakness: CWE-269
Which versions are affected by CVE-2026-66399?
How do I fix CVE-2026-66399?
No fix has been published for CVE-2026-66399 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-66399 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66399 exists.
Sources
Also known as GHSA-28cc-v39j-vr95, GHSA-5w7v-f8fx-865c.