Authentication Bypass in phpMyFAQ API Allowing Unauthenticated Modifications
CVE-2026-35672

8.7HIGH

Key Information:

Vendor

Thorsten

Status
pHPMyFAQ
Vendor
CVE Published:
28 May 2026

What is CVE-2026-35672?

An authentication bypass vulnerability exists in the phpMyFAQ API prior to version 4.1.3. The issue arises from the use of a default empty api.apiClientToken, enabling unauthenticated users to create and modify FAQ entries. By sending an empty x-pmf-token header, attackers can circumvent token validation and exploit POST endpoints such as /api/v4.0/faq/create, /api/v4.0/category, and /api/v4.0/question to inject malicious content.

Affected Version(s)

phpMyFAQ 0 < 4.1.3

phpMyFAQ 4.1.3

References

https://github.com/thorsten/phpMyFAQ/security/advisories/...
vendor-advisory
https://www.vulncheck.com/advisories/phpmyfaq-authenticat...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

guayu-kakeru
.