CVE-2026-85590
phpMyFAQ before 4.1.8 Authentication Bypass via Two-Factor Disable
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.
| CWE | CWE-308 |
| Vendor | thorsten |
| Product | phpmyfaq |
| Published | Sep 4, 2026 |
| Last Updated | Sep 4, 2026 |
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