CVE-2026-66399 | phpMyFAQ before 4.1.6 contains a privilege escalation vulner… | CVSS 6.5 MEDIUM

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.

Metadata

CVE ID: CVE-2026-66399
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-26 12:22 UTC
Published: 2026-07-27 15:43 UTC
Last updated: 2026-07-28 14:54 UTC
Primary CWE: CWE-269
Improper Privilege Management
Vendor / Product: thorsten / phpMyFAQ
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
thorsten	phpMyFAQ	—	0 < 4.1.6, 4.1.6

Weakness (CWE)

CWE	Source	Description
CWE-269	cna	Improper Privilege Management

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.5	HIGH	4.0	cna	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
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

References (2)

GitHub Security Advisory (GHSA-28cc-v39j-vr95) https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-28cc-v39j-vr95
VulnCheck Advisory: phpMyFAQ before 4.1.6 Privilege Escalation via Group Membership https://www.vulncheck.com/advisories/phpmyfaq-before-privilege-escalation-via-group-membership