Vulnerability · Published May 28, 2026 · Assigned by VulnCheck

CVE-2026-35672phpMyFAQ - Authentication Bypass via Empty API Token

High 7.5

In plain English

A high-severity security flaw in phpMyFAQ from thorsten. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.5%top 58.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

phpMyFAQ before 4.1.3 contains an authentication bypass vulnerability in API v4.0 where the default empty api.apiClientToken allows unauthenticated users to create and modify FAQ entries. Attackers can send an empty x-pmf-token header to bypass token validation and inject malicious content via POST endpoints /api/v4.0/faq/create, /api/v4.0/category, and /api/v4.0/question.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	phpmyfaq/phpmyfaq	4.1.3	GHSA-gp95-j463-vv28
Packagist	thorsten/phpmyfaq	4.1.3	GHSA-gp95-j463-vv28

Affected products (as reported)

Vendor	Product	Versions
thorsten	phpMyFAQ	0 – before 4.1.3

Weakness: CWE-1188 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

GHSA Advisory GHSA-gp95-j463-vv28 vendor-advisory
VulnCheck Advisory: phpMyFAQ - Authentication Bypass via Empty API Token third-party-advisory