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OpenAdvisories
High · 7.5 CVE-2026-27836 EUVD-2026-9059GHSA-w22q-m2fm-x9f4

phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint

Published Feb 27, 2026 · Updated Mar 3, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
thorsten phpMyFAQ < 4.0.18 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist thorsten/phpmyfaq < 4.0.18 4.0.18 GHSA-w22q-m2fm-x9f4

References