CVE-2026-85590
Severity not reportedphpMyFAQ before 4.1.8 contains an authentication bypass vulnerability in its two-factor authentication (TOTP) disable functionality.
phpMyFAQ before 4.1.8 contains an authentication bypass vulnerability in its two-factor authentication (TOTP) disable functionality. The removeTwofactorConfig() handler (reachable via POST /api/user/remove-twofactor) verifies only that the user is logged in and that a valid CSRF token is supplied, then disables TOTP without requiring password re-entry or a current TOTP code. The same downgrade is also reachable inline via PUT /api/user/data/update, which accepts a plain twofactor_enabled form field under the same session+CSRF-only guard. An attacker who has hijacked a user's session can silently strip two-factor protection from any account, including administrator accounts, after which password-only authentication succeeds.
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-h96g-59xp-7r5m disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/phpmyfaq-before-4.1.8-authentication-bypass-via-two-f... disclosure@vulncheck.com
- https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-h96g-59xp-7r5m 134c704f-9b21-4f2e-91b3-4a467353bcc0