Auth bypass in Phpmyfaq
CVE-2026-76209
phpMyFAQ versions before v4.1.6 fail to validate the security.enableRegistration setting in API endpoints, allowing attackers to create user accounts when registration is disabled. Attackers can bypass the registration restriction by submitting requests to POST /api/register or POST /api/v3.1/register endpoints, which do not check the configuration flag enforced by the HTML registration page.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/thorsten/phpMyFAQ/security/advisories/GHSA-h7q4-qgc4-c9vm (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/phpmyfaq-before-registration-bypass-via-api (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-76209?
- CVE-2026-76209 is a medium-severity vulnerability in Phpmyfaq, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-08-19.
- How severe is CVE-2026-76209?
- Medium severity. CVSS v3 base score is 4.3 out of 10.