{"id":"CVE-2026-85590","title":"phpMyFAQ before 4.1.8 contains an authentication bypass vulnerability in its two-factor authentication (TOTP) disable functionality","summary":"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 t…","severity":"none","cwe":["CWE-308"],"published":"2026-09-04","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:05:53.177","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85590","references":[{"url":"https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-h96g-59xp-7r5m","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/phpmyfaq-before-4.1.8-authentication-bypass-via-two-factor-disable","label":"disclosure@vulncheck.com"},{"url":"https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-h96g-59xp-7r5m","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00386,"epssPercentile":0.32547,"ingestedAt":"2026-09-08T20:10:03.165Z","slug":"CVE-2026-85590","body":"## Overview\n\nphpMyFAQ 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}