Improper Authentication in phpMyFAQ - CVE-2026-56737
Published: July 14, 2026
Vulnerability identifier: #VU137465
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-56737
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Thorsten Rinne
Affected software:
phpMyFAQ
phpMyFAQ
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authentication and take over accounts.
The vulnerability exists due to improper authentication in the public two-factor verification endpoint `/check` when handling crafted authentication requests with an attacker-chosen `user-id` and TOTP token. A remote attacker can send a specially crafted request to bypass authentication and take over accounts.
Only accounts with two-factor authentication enabled are affected, and a valid password is not required for the affected login flow.
How to mitigate CVE-2026-56737
Install security update from vendor's website.