CVE-2026-89254 AVideo CustomizeUser Stored XSS via field_name Parameter
Administrators can inject malicious scripts via the field_name parameter in the CustomizeUser plugin, leading to stored XSS execution on user profiles.
- 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-2026-89254?
CVE-2026-89254 is a critical cross-site scripting vulnerability in WWBN AVideo, published on 11 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
AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the CustomizeUser plugin where the field_name parameter is stored raw without sanitization. Administrators can inject malicious scripts via the add.json.php endpoint that execute when viewing extra info pages or profile forms that render the typeToHTML function.
Weakness: CWE-79
Which versions are affected by CVE-2026-89254?
How do I fix CVE-2026-89254?
No fix has been published for CVE-2026-89254 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-2026-89254 being exploited?
There is no known exploitation of CVE-2026-89254 in the wild and no public exploit code.
Sources
Also known as GHSA-7hj4-f9x4-gg7p, GHSA-8cc3-9p8w-vg36.