CVE-2026-85593 phpMyFAQ before 4.1.8 Stored XSS via html_entity_decode
Authenticated users can inject JavaScript into FAQs via html_entity_decode, leading to XSS execution in other users' browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-85593?
CVE-2026-85593 is a medium-severity cross-site scripting vulnerability in thorsten phpMyFAQ, published on 4 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
phpMyFAQ versions before 4.1.8 contain a stored cross-site scripting vulnerability in FaqHelper::convertOldInternalLinks() that calls html_entity_decode() on sanitized FAQ content, reversing entity-encoding protection. Authenticated users with FAQ editing privileges can inject JavaScript payloads that execute in the browsers of all users viewing the affected FAQ pages.
Weakness: CWE-79
Which versions are affected by CVE-2026-85593?
How do I fix CVE-2026-85593?
No fix has been published for CVE-2026-85593 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-85593 being exploited?
There is no known exploitation of CVE-2026-85593 in the wild and no public exploit code.
Sources
Also known as GHSA-2xm9-x25x-7x5q, GHSA-x6qj-5jhf-xgpm.