CVE-2026-89256 AVideo Bookmark Plugin Stored XSS via Chapter Names
A video owner can inject malicious scripts via bookmark names, allowing execution in the context of other visitors on the AVideo platform.
- 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-2026-89256?
CVE-2026-89256 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 Bookmark plugin where chapter names are not encoded before being concatenated into public watch-page HTML. A video owner can inject malicious scripts via the bookmark name parameter, and every visitor of that video executes the payload in the AVideo origin.
Weakness: CWE-79
Which versions are affected by CVE-2026-89256?
How do I fix CVE-2026-89256?
No fix has been published for CVE-2026-89256 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-2026-89256 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89256 exists.
Sources
Also known as GHSA-h362-pv2x-28jm, GHSA-jggq-mm5m-r5wv.