CVE-2026-89239 WWBN AVideo Reflected XSS via Referer Header Comment Breakout
Attackers can inject arbitrary JavaScript via the Referer header in AVideo, executing code in the victim's browser session.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-89239?
CVE-2026-89239 is a medium-severity cross-site scripting vulnerability in WWBN AVideo, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a reflected cross-site scripting vulnerability in the showAlertMessage() function that inserts the raw Referer header into a JavaScript comment without encoding. Attackers can craft a Referer header containing */ to close the comment and inject arbitrary JavaScript that executes in the site origin for visitors arriving from the attacker-controlled page.
Weakness: CWE-79
Which versions are affected by CVE-2026-89239?
How do I fix CVE-2026-89239?
No fix has been published for CVE-2026-89239 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-2026-89239 being exploited?
There is no known exploitation of CVE-2026-89239 in the wild and no public exploit code.
Sources
Also known as GHSA-3pp9-g99w-qw3j, GHSA-hvjj-pf95-jcvw.