# CVE-2025-49135: CVAT missing validation for in-progress backup upload names

> Attackers with user accounts can steal other users' backup data by referencing their filenames during import due to missing ownership validation.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Jun 2025
- **Updated:** 25 Jun 2025
- **Also known as:** GHSA-frpr-5w6q-hh4f

## What is CVE-2025-49135?

CVE-2025-49135 is a medium-severity missing authorization vulnerability in cvat-ai cvat, published on 25 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

CVAT is an open source interactive video and image annotation tool for computer vision. Versions 2.2.0 through 2.39.0 have no validation during the import process of a project or task backup to check that the filename specified in the query parameter refers to a TUS-uploaded file belonging to the same user. As a result, if an attacker with a CVAT account and a `user` role knows the filenames of other users' uploads, they could potentially access and steal data by creating projects or tasks using those files.  This issue does not affect annotation or dataset TUS uploads, since in this case object-specific temporary directories are used. Users should upgrade to CVAT 2.40.0 or a later version to receive a patch. No known workarounds are available.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2025-49135?

It affects 1 product.


Products: Cvat Computer Vision Annotation Tool.

## How do I fix CVE-2025-49135?

No fix has been published for CVE-2025-49135 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-49135 being exploited?

There is no known exploitation of CVE-2025-49135 in the wild and no public exploit code.

## Other vulnerabilities in cvat-ai cvat

- [CVE-2025-23045](https://insights.sbomify.com/CVE-2025-23045/): CVAT allows remote code execution via tracker Nuclio functions (high 8.7)
- [CVE-2026-23516](https://insights.sbomify.com/CVE-2026-23516/): CVAT vulnerable to XSS via skeleton SVG images (high 8.6)
- [CVE-2022-31188](https://insights.sbomify.com/CVE-2022-31188/): Server-Side Request Forgery Vulnerability in Computer Vision Annotation Tool (CVAT) (high 8.6)
- [CVE-2026-23526](https://insights.sbomify.com/CVE-2026-23526/): CVAT vulnerable to privilege escalation of users with staff status (high 8.5)
- [CVE-2024-37164](https://insights.sbomify.com/CVE-2024-37164/): CVAT SSRF via custom cloud storage endpoints (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-49135 and fix it if it is affected.

What it is: CVE-2025-49135 is a medium-severity missing authorization vulnerability in cvat-ai cvat, published on 25 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-49135 in the wild and no public exploit code.

Affected product: cvat-ai cvat. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-49135/ (Markdown: https://insights.sbomify.com/CVE-2025-49135/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-49135
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-49135
- OSV: https://osv.dev/vulnerability/CVE-2025-49135

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-49135/
Summaries are generated and may contain mistakes; the official description above is the record.