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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
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 67.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 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
Open in CVSS calculator →

Weaknesses

CWE-862

Affected Products

phpmyfaqphpmyfaqWeb & CMS Plugins
thorsten/phpmyfaqPackagistOSS Libraries
phpMyFAQthorsten
On-premWeb App
Web & CMS Plugins
phpmyfaqoss-projectWeb & CMS Pluginsaka phpmyfaq, phpmyfaq
packagistpackage-ecosystemOSS Libraries
thorstenindividual-devWeb & CMS Pluginsaka thorsten/phpmyfaq, phpmyfaq

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

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 →

Timeline

Published
Feb 27, 2026
Last Updated
Mar 4, 2026

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