CVE-2026-65986 CVAT has stored XSS via annotation guide assets
Attackers can execute arbitrary JavaScript in victims' browsers by uploading malicious annotation guide assets with manipulated content types.
- 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-2026-65986?
CVE-2026-65986 is a high-severity cross-site scripting vulnerability in cvat-ai cvat, published on 4 Aug 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
CVAT is an open source interactive video and image annotation tool for computer vision. Versions 2.5.0 through 2.66.0 contain a XSS vulnerability that can be accessed through annotation guide assets. When CVAT serves the files attached to an annotation guide, it labels them with a media type ( Content-Type ) that the attacker can influence, so instead of treating an uploaded file as plain data, the victim's browser can be told to treat it as an HTML page and run any JavaScript inside it. This issue has been fixed in version 2.67.0.
Which versions are affected by CVE-2026-65986?
How do I fix CVE-2026-65986?
No fix has been published for CVE-2026-65986 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-2026-65986 being exploited?
There is no known exploitation of CVE-2026-65986 in the wild and no public exploit code.
Sources
Also known as GHSA-w6mx-95ff-72cv.