CVE-2026-27836
February 27, 2026
phpMyFAQ is an open source FAQ web application. Prior to version 4.0.18, the WebAuthn prepare endpoint ("/api/webauthn/prepare") creates new active user accounts without any authentication, CSRF protection, captcha, or configuration checks. This allows unauthenticated attackers to create unlimited user accounts even when registration is disabled. Version 4.0.18 fixes the issue.
Affected Packages
https://github.com/thorsten/phpMyFAQ.git (GITHUB):
Affected version(s) >=2.5.2 <4.0.18Fix Suggestion:
Update to version 4.0.18thorsten/phpmyfaq (PHP):
Affected version(s) >=dev-add-claude-github-actions-1771752359307 <4.0.18Fix Suggestion:
Update to version 4.0.18thorsten/phpmyfaq (PHP):
Affected version(s) >=2.5.2 <4.0.18Fix Suggestion:
Update to version 4.0.18Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Missing Authorization
EPSS
Base Score:
0.04
