CVE-2026-27836
phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 7.5EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
27 Feb 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products
thorsten · phpMyFAQWant to know if your infrastructure is exposed to this?
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