Vulnerability Report

CVE-2026-27836

Title: Unauthenticated Account Creation in phpMyFAQ

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-27836.

CWE Category CWE-862

Published Date Feb 27, 2026

Modified Date Mar 04, 2026

Exploit Status Not Found

Score 7.5 CVSS v3.1

Exploit Probability (EPSS)

0.41%

Vulnerability Summary

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. This allows unauthenticated attackers to create unlimited user accounts even when registration is disabled. Version 4.0.18 fixes the issue.

Impacted Vendors

phpmyfaq 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-27836 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

March 04, 2026 MODIFIED

Vulnerability data updated via NVD.

March 04, 2026 MODIFIED

Vulnerability data updated via NVD.

March 02, 2026 MODIFIED

Vulnerability data updated via NVD.

February 27, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.