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Vulnerability record · CVE-2026-27836 · published 27 February 2026

CVE-2026-27836: Phpmyfaq missing authorization vulnerability

Phpmyfaq · Phpmyfaq

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.

7.5 CVSS 3.1 High EPSS 0.49% · top 60.0% CWE-862 · Missing authorization
7.5CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-59943Phpmyfaq improper access control vulnerabilityphpMyFAQ is an open source FAQ web application. Versions 4.0-nightly-2025-10-03 and below do not enforce uniqueness of email addresses during user re…EPSS 0.42%9.8CVE-2023-5865Phpmyfaq insufficient session expiration vulnerabilityInsufficient Session Expiration in GitHub repository thorsten/phpmyfaq prior to 3.2.2.EPSS 0.58%9.8CVE-2023-5227Phpmyfaq unrestricted file upload vulnerabilityUnrestricted Upload of File with Dangerous Type in GitHub repository thorsten/phpmyfaq prior to 3.1.8.EPSS 0.52%9.8CVE-2023-4006Phpmyfaq csv injection vulnerabilityImproper Neutralization of Formula Elements in a CSV File in GitHub repository thorsten/phpmyfaq prior to 3.1.16.EPSS 0.81%9.8CVE-2023-2429Phpmyfaq improper access control vulnerabilityImproper Access Control in GitHub repository thorsten/phpmyfaq prior to 3.1.13.EPSS 0.53%9.8CVE-2023-1886Phpmyfaq authentication bypass by capture-replay vulnerabilityAuthentication Bypass by Capture-replay in GitHub repository thorsten/phpmyfaq prior to 3.1.12.EPSS 0.88%9.8CVE-2023-1753Phpmyfaq weak password requirements vulnerabilityWeak Password Requirements in GitHub repository thorsten/phpmyfaq prior to 3.1.12.EPSS 0.72%9.8CVE-2023-0788Phpmyfaq code injection vulnerabilityCode Injection in GitHub repository thorsten/phpmyfaq prior to 3.1.11.EPSS 0.89%

Source: NIST National Vulnerability Database (record CVE-2026-27836), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.