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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| thorsten | phpMyFAQ | unaffected |
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Advisories
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Fixes
Solution
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Workaround
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References
History
Fri, 04 Sep 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | phpMyFAQ before 4.1.8 Authentication Bypass via Two-Factor Disable | |
| First Time appeared |
Phpmyfaq
Phpmyfaq phpmyfaq |
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| Weaknesses | CWE-308 | |
| CPEs | cpe:2.3:a:phpmyfaq:phpmyfaq:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Phpmyfaq
Phpmyfaq phpmyfaq |
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| References |
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| Metrics |
cvssV4_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-09-04T11:29:56.063Z
Reserved: 2026-09-04T10:59:00.162Z
Link: CVE-2026-85590
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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Weaknesses