CVE-2026-27836

phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint

CVSS 7.5 HIGHEPSS 0.4%CWE-862

Vexday Risk Score

21Baixo

Decisão SSVC (CISA)

Track

Sem sinal de exploração → monitorar

CVSS 7.5EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

27 fev 2026Publicada no NVD

Recomendação: Monitorar — sem sinal de exploração no momento.

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

Produtos afetados

thorsten · phpMyFAQ

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Referências

https://github.com/thorsten/phpMyFAQ/commit/f2ab673f0668753cd0f7c7c8bc7fd2304dcf5cb1 https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w22q-m2fm-x9f4