Improper Restriction of Excessive Authentication Attempts in phpMyFAQ - #VU164477
Published: November 10, 2026
Vulnerability identifier: #VU164477
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-307
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to permanently disable two-factor authentication on a compromised account.
The vulnerability exists due to improper restriction of excessive authentication attempts in phpMyFAQ's removeTwofactorConfig() endpoint when validating codes for two-factor authentication removal, with neither lockout nor rate limiting enforced. A remote attacker can use an already-authenticated victim session and its removal CSRF token to submit unlimited code guesses to POST /api/user/remove-twofactor until a valid code disables the account's two-factor authentication.
Affected software
phpMyFAQ
Remediation
Install security update from vendor's website.
phpMyFAQ - update to 4.1.9