Use of Single-factor Authentication in phpMyFAQ - CVE-2026-85590
Published: August 21, 2026 / Updated: September 14, 2026
Vulnerability identifier: #VU144534
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-85590
CWE-ID: CWE-308
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disable two-factor authentication for the current account.
The vulnerability exists due to use of single-factor authentication in the user API endpoints when handling requests to disable two-factor authentication or update the twofactor_enabled setting. A remote user can send a specially crafted request with a valid session cookie and CSRF token to disable two-factor authentication for the current account.
This affects both the POST /api/user/remove-twofactor endpoint and the inline toggle via PUT /api/user/data/update.
Affected software
phpMyFAQ
How to mitigate CVE-2026-85590
Install security update from vendor's website.
phpMyFAQ - update to 4.1.8