What is CVE-2026-27836?

CVE-2026-27836 is a high-severity vulnerability in Thorsten Phpmyfaq, classified under Missing Authorization. CVSS score: 7.5/10. Published 2026-02-27.

How severe is CVE-2026-27836?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Thorsten Phpmyfaq

CVE-2026-27836

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…

Vulnerability class: Broken Access Control

EPSS: 0.001 (19.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Thorsten Phpmyfaq — versions < 4.0.18

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

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

Frequently asked questions

What is CVE-2026-27836?: CVE-2026-27836 is a high-severity vulnerability in Thorsten Phpmyfaq, classified under Missing Authorization. CVSS score: 7.5/10. Published 2026-02-27.
How severe is CVE-2026-27836?: High severity. CVSS v3 base score is 7.5 out of 10.