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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-w22q-m2fm-x9f4 phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 04 Mar 2026 16:15:00 +0000

Type Values Removed Values Added
First Time appeared Phpmyfaq
Phpmyfaq phpmyfaq
CPEs cpe:2.3:a:phpmyfaq:phpmyfaq:*:*:*:*:*:*:*:*
Vendors & Products Phpmyfaq
Phpmyfaq phpmyfaq

Tue, 03 Mar 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 02 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Thorsten
Thorsten phpmyfaq
Vendors & Products Thorsten
Thorsten phpmyfaq

Fri, 27 Feb 2026 20:15:00 +0000

Type Values Removed Values Added
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.
Title phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-03T20:25:01.562Z

Reserved: 2026-02-24T02:32:39.801Z

Link: CVE-2026-27836

cve-icon Vulnrichment

Updated: 2026-03-03T20:24:58.288Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-27T20:21:40.330

Modified: 2026-03-04T16:08:53.133

Link: CVE-2026-27836

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-02T12:05:02Z

Weaknesses