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CVE-2026-27836

phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint

Published: Feb 27, 2026Updated: Mar 4, 2026 Sources: CVE List NVD GHSACWE-862
7.5HIGH
NVD MITRE
EPSS Score
0.4%
Top 66.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-862

Affected Products

phpmyfaq
oss-project
phpmyfaq
Web & CMS Plugins
Packagist
package-ecosystem
thorsten/phpmyfaq
OSS Libraries
thorsten
individual-devaka thorsten/phpmyfaq, phpmyfaq
phpMyFAQOn-premWeb App
Web & CMS Plugins

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/thorsten/phpMyFAQ/commit/f2ab673f0668753cd0f7c7c8bc7fd2304dcf5cb1
github.com
https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-w22q-m2fm-x9f4
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-27836
nvd.nist.gov
and 1 more references View all →

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