XSS Vulnerability in CVAT Open Source Annotation Tool
CVE-2026-65986

8.5HIGH

Key Information:

Vendor

Cvat-ai

Status
Cvat
Vendor
CVE Published:
4 August 2026

What is CVE-2026-65986?

CVAT, an open-source tool for interactive video and image annotation, has a XSS vulnerability in versions from 2.5.0 to 2.66.0. This vulnerability arises from improper handling of the Content-Type of files linked to annotation guides. An attacker can manipulate this content type, subsequently encouraging the victim's browser to execute malicious scripts contained within the files, rather than treating them as standard data. This flaw can lead to significant security risks, as it allows the execution of arbitrary JavaScript in the context of the victim’s session. Users are strongly advised to upgrade to version 2.67.0 or later, where this issue has been addressed.

Affected Version(s)

cvat >= 2.5.0, < 2.67.0

References

https://github.com/cvat-ai/cvat/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/cvat-ai/cvat/commit/44d717ad3a9d914f1c...
x_refsource_MISC

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.