CVE-2026-111903 phpMyFAQ 4.2.0-alpha before 4.2.0-beta Stored XSS via SVG DTD Entity Bypass
Authenticated users can inject malicious scripts via SVG files, leading to session hijacking of administrators.
- 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-2026-111903?
CVE-2026-111903 is a medium-severity cross-site scripting vulnerability in thorsten phpMyFAQ, published on 17 Oct 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 4.2.0-alpha before 4.2.0-beta contains a stored cross-site scripting vulnerability in SvgSanitizer that allows users with FAQ_EDIT permission to bypass sanitization using XML DTD custom entities. Attackers can upload an SVG defining an entity that expands to javascript in an anchor href, executing script when viewers click it to hijack admin sessions.
Weakness: CWE-79
Which versions are affected by CVE-2026-111903?
How do I fix CVE-2026-111903?
No fix has been published for CVE-2026-111903 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-2026-111903 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111903 exists.
Sources
Also known as GHSA-4fcw-x9vq-q4pp, GHSA-j3v5-p957-w6gq.