CVE-2026-56736
phpMyFAQ has Stored XSS in Admin FAQ Editor via HTML Entity Bypass in Frontend FAQ Submission
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | thorsten/phpmyfaq | < 4.2.0-alpha | 4.2.0-alpha |
| composer | phpmyfaq/phpmyfaq | < 4.2.0-alpha | 4.2.0-alpha |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-pgwp-vc7q-cvj3
- https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-pgwp-vc7q-cvj3
- https://nvd.nist.gov/vuln/detail/CVE-2026-56736
- https://github.com/thorsten/phpMyFAQ/commit/24b68068747ad632398e3b3bab2989e76e43ef82
- https://github.com/thorsten/phpMyFAQ/releases/tag/4.2.0-alpha