CVE-2026-56736: Thorsten Phpmyfaq

High severity, CVSS 8.2. EPSS: 0.2% chance of exploitation in the next 30 days.

phpMyFAQ is an open source FAQ web application. A stored cross-site scripting (XSS) vulnerability in versions prior to 4.2.0-alpha allows any unauthenticated user (or low-privileged registered user) to inject arbitrary JavaScript that executes in an administrator's browser when they review or edit a user-submitted FAQ entry. This leads to admin account takeover via session theft. The vulnerability exists because `html_entity_decode()` converts HTML entities into executable HTML after `strip_tags()` has already passed them through, and the admin template renders the content with Twig's `|raw` filter without any output sanitization. Version 4.2.0-alpha fixes the issue.

Affected products

• Thorsten Phpmyfaq: before 4.2.0-alpha (fixed in 4.2.0-alpha)

Published 2026-09-24. Last modified 2026-09-24.