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Vulnerability record · CVE-2026-66399 · published 27 July 2026

CVE-2026-66399: Improper privilege management vulnerability

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.

8.5 CVSS 4.0 High EPSS 0.40% · top 68.2% CWE-269 · Improper privilege management Deferred
8.5CVSS 4.0 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
28 Jul 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-66399), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.