CVE-2026-65986: CVAT has stored XSS via annotation guide assets
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
CVATto a version that resolves this vulnerability.Fixed in 2.67.0 - Compensating control
For CVAT versions 2.5.0 through 2.66.0, mitigate the stored XSS by preventing attacker-controlled Content-Type behavior when serving annotation guide assets (ensure uploaded/attached guide asset files are not served with an attacker-influenced Content-Type that causes the browser to execute the content as HTML/JavaScript).
Event History
Frequently Asked Questions
What is the severity of CVE-2026-65986?
The severity of CVE-2026-65986 is rated as high, with a CVSS score of 8.5.
How do I fix CVE-2026-65986?
To fix CVE-2026-65986, upgrade CVAT to versions beyond 2.66.0 where the vulnerability has been patched.
What type of vulnerability is CVE-2026-65986?
CVE-2026-65986 is a stored Cross-Site Scripting (XSS) vulnerability via annotation guide assets.
Which versions of CVAT are affected by CVE-2026-65986?
CVAT versions from 2.5.0 through 2.66.0 are affected by CVE-2026-65986.
What impact does CVE-2026-65986 have on users?
CVE-2026-65986 can allow attackers to inject malicious scripts into the system through annotation guide assets, potentially compromising user data.