CVE-2026-27836: phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint

February 27, 2026

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.

References

github.com/advisories/GHSA-w22q-m2fm-x9f4
github.com/thorsten/phpMyFAQ
github.com/thorsten/phpMyFAQ/commit/f2ab673f0668753cd0f7c7c8bc7fd2304dcf5cb1
github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w22q-m2fm-x9f4
nvd.nist.gov/vuln/detail/CVE-2026-27836

Code Behaviors & Features

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