CVE-2026-111898: Improper Authentication in thorsten phpMyFAQ
Description
phpMyFAQ 4.2.0-alpha before 4.2.0-beta contains an authentication bypass vulnerability that allows Keycloak users to take over local accounts by matching preferred_username or email. Attackers controlling a Keycloak identity with a colliding username or unverified email can log in through /auth/keycloak/authorize to bind their subject and gain superadmin privileges.
CVSS v4.0
Score 7.7high
Affected software
thorsten
phpMyFAQ
pkg:github/thorsten/phpMyFAQRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-111898 is an authentication bypass vulnerability in phpMyFAQ affecting versions >=4.2.0-alpha and <4.2.0-beta. The vulnerability arises because Keycloak users can take over local accounts if their Keycloak preferred_username or email collides with those of local accounts. Attackers controlling such Keycloak identities can authenticate via /auth/keycloak/authorize, binding their subject to the local account and escalating privileges to superadmin.
Potential Impact
Successful exploitation allows an attacker with a controlled Keycloak identity to bypass normal authentication controls and gain superadmin privileges on phpMyFAQ. This could lead to full administrative control over the affected phpMyFAQ instance.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict or monitor Keycloak integration and carefully validate Keycloak user attributes to prevent account takeover via username or email collisions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-17T12:16:44.850Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad3c6d02cdf04f656520800
Added to database: 10/17/2026, 19:04:48 UTC
Last enriched: 10/17/2026, 19:19:34 UTC
Last updated: 10/17/2026, 22:21:03 UTC
Views: 3
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