CVE-2026-27836
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductPhpmyfaq
PublishedFeb 27, 2026
First seenFeb 27, 2026
Weakness typeCWE-862Missing authorization
How to fix
Update
- phpmyfaq phpmyfaq4.0.18 or later
- thorsten/phpmyfaq4.0.18 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| phpmyfaq phpmyfaq | v < 4.0.18 | 4.0.18 |
| thorsten/phpmyfaqPackagist | v < 4.0.18 | 4.0.18 |
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