phpMyFAQ's two-factor authentication login bypasses the password factor

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

phpMyFAQ is an open source FAQ web application. Versions 3.2.0 through 4.1.5 contain an authentication bypass in its public two-factor authentication verification flow: an unauthenticated attacker can submit an account’s numeric user ID and a valid or brute-forced six-digit TOTP code without first authenticating with the account password, allowing takeover of any 2FA-enabled account, including administrator accounts. Version 4.1.6 is patched by binding TOTP verification to a session established after successful password authentication and limiting failed TOTP attempts. No official workaround is documented; affected installations should upgrade to 4.1.6 or later.

[ Fixes ]Fixes and patches

• thorsten/phpmyfaq 4.1.6Fixed version · GitHub Advisories · composer package thorsten/phpmyfaq: upgrade to 4.1.6 or later (affected >= 3.2.0, < 4.1.6)
• phpmyfaq/phpmyfaq 4.1.6Fixed version · GitHub Advisories · composer package phpmyfaq/phpmyfaq: upgrade to 4.1.6 or later (affected >= 3.2.0, < 4.1.6)

[ Packages ]Affected open-source packages

• thorsten/phpmyfaq composerAffected >= 3.2.0, < 4.1.6 · fixed in 4.1.6 · GHSA-8gpw-xvpf-hvx5
• phpmyfaq/phpmyfaq composerAffected >= 3.2.0, < 4.1.6 · fixed in 4.1.6 · GHSA-8gpw-xvpf-hvx5

[ References ]References

• github.com/thorsten/phpMyFAQ/commit/410208b90f1d01534812ac5203d3e8d9c7bd591f
• github.com/thorsten/phpMyFAQ/commit/5097dff341fb01e93e8561e7261b3ae657df715a
• github.com/thorsten/phpMyFAQ/commit/6a69f6e2142fde722165c65b7e0a49f3176e87be
• github.com/thorsten/phpMyFAQ/security/advisories/GHSA-8gpw-xvpf-hvx5