CVE-2026-27836: phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint

high Affects thorsten/phpmyfaq. Feed 2026.10.29.1, updated 2026-10-28; published 2026-02-27; advisory modified 2026-02-28.

phpMyFAQ Allows Unauthenticated Account Creation via WebAuthn Prepare Endpoint

Package: thorsten/phpmyfaq Composer
Affected versions: <4.0.18
Fixed in: 4.0.18
Severity: high CVSS 7.5
Exploitation: not on CISA KEV · EPSS 0% (39.2th percentile)
Published: 2026-02-27
Source: osv.dev

References

CWE-862

NVD record thorsten/phpmyfaq advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# one-time install
pip install phpwarden

# then
phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2022-3766 medium phpMyFAQ vulnerable to reflected Cross-site Scripting same package: thorsten/phpmyfaq
CVE-2022-4407 medium phpMyFAQ vulnerable to Cross-site Scripting same package: thorsten/phpmyfaq
CVE-2024-55889 medium thorsten/phpmyfaq Unintended File Download Triggered by Embedded Frames same package: thorsten/phpmyfaq
CVE-2025-69200 high phpMyFAQ has unauthenticated config backup download via /api/setup/backup same package: thorsten/phpmyfaq
CVE-2026-24421 medium phpMyFAQ: /api/setup/backup accessible to any authenticated user (authz missing) same package: thorsten/phpmyfaq
CVE-2026-46364 critical phpMyFAQ has unauthenticated SQL injection via User-Agent header in BuiltinCaptcha same package: thorsten/phpmyfaq