Auth bypass in Phpmyfaq
CVE-2026-24421
phpMyFAQ is an open source FAQ web application. Versions 4.0.16 and below have flawed authorization logic which exposes the /api/setup/backup endpoint to any authenticated user despite their permissions. SetupController.php uses userIsAuthenticated() but does not verify that the requester has configuration/admin permissions. Non-admin users can trigger a configuration backup and retrieve its path. The endpoint only checks authentication, not authorization, and returns a link to the generated ZIP. This issue is fixed in version 4.0.17.
Vulnerability class: Broken Access Control
EPSS: 0.018 (75.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Phpmyfaq
- Thorsten Phpmyfaq — versions < 4.0.17
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-24421?
- CVE-2026-24421 is a medium-severity vulnerability in Phpmyfaq, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-01-24.
- How severe is CVE-2026-24421?
- Medium severity. CVSS v3 base score is 6.5 out of 10.