High severityNVD Advisory· Published Feb 27, 2026· Updated Mar 3, 2026
phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint
CVE-2026-27836
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
thorsten/phpmyfaqPackagist | < 4.0.18 | 4.0.18 |
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-w22q-m2fm-x9f4ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-27836ghsaADVISORY
- github.com/thorsten/phpMyFAQ/commit/f2ab673f0668753cd0f7c7c8bc7fd2304dcf5cb1ghsax_refsource_MISCWEB
- github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w22q-m2fm-x9f4ghsax_refsource_CONFIRMWEB
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