CVE-2026-89243 WWBN AVideo Stored XSS via UserGroups setGroup_name
Administrators can inject malicious scripts via group names, leading to code execution in other administrators' browsers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-89243?
CVE-2026-89243 is a critical cross-site scripting vulnerability in WWBN AVideo, published on 11 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in UserGroups::setGroup_name() that fails to sanitize group_name input. Administrators with canAdminUserGroups permission can inject malicious HTML and JavaScript that executes in the browser when other administrators access the user manager interface.
Weakness: CWE-79
Which versions are affected by CVE-2026-89243?
How do I fix CVE-2026-89243?
No fix has been published for CVE-2026-89243 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-2026-89243 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89243 exists.
Sources
Also known as GHSA-4773-89rr-mp32, GHSA-qm3h-2jrx-xmg6.