Improper Restriction of Excessive Authentication Attempts in phpMyFAQ - #VU130117
Published: May 5, 2026
Vulnerability identifier: #VU130117
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: N/A
CWE-ID: CWE-307
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 two-factor authentication and gain full administrative access.
The vulnerability exists due to improper restriction of excessive authentication attempts in the /admin/check endpoint in AuthenticationController when handling unauthenticated 2FA token submissions with an arbitrary user-id. A remote attacker can send repeated crafted POST requests with arbitrary user-id and token values to bypass two-factor authentication and gain full administrative access.
The endpoint is reachable without a prior authenticated session and does not bind the 2FA check to a password-verified login flow.
Remediation
Install security update from vendor's website.