# CVE-2025-55011: Kanboard Path Traversal in File Write via Task File Upload Api

> Attackers can write arbitrary files to the server via the task file upload API due to missing path validation, potentially modifying system files.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A: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:** 12 Aug 2025
- **Updated:** 12 Aug 2025
- **Also known as:** GHSA-26f4-rx96-xc55

## What is CVE-2025-55011?

CVE-2025-55011 is a medium-severity path traversal vulnerability in kanboard, published on 12 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Kanboard is project management software that focuses on the Kanban methodology. Prior to version 1.2.47, the createTaskFile method in the API does not validate whether the task_id parameter is a valid task id, nor does it check for path traversal. As a result, a malicious actor could write a file anywhere on the system the app user controls. The impact is limited due to the filename being hashed and having no extension. This issue has been patched in version 1.2.47.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2025-55011?

It affects 1 product.


Products: Kanboard Kanboard.

## How do I fix CVE-2025-55011?

No fix has been published for CVE-2025-55011 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-55011 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55011 exists.

## Other vulnerabilities in kanboard

- [CVE-2026-21881](https://insights.sbomify.com/CVE-2026-21881/): Kanboard is Vulnerable to Reverse Proxy Authentication Bypass (critical 9.1)
- [CVE-2025-55010](https://insights.sbomify.com/CVE-2025-55010/): Kanboard Authenticated Admin Remote Code Execution via Unsafe Deserialization of Events (critical 9.1)
- [CVE-2024-51747](https://insights.sbomify.com/CVE-2024-51747/): Arbitrary File Read and Delete in kanboard (critical 9.1)
- [CVE-2024-51748](https://insights.sbomify.com/CVE-2024-51748/): Remote code execution through language setting in kanboard (critical 9.1)
- [CVE-2017-12850](https://insights.sbomify.com/CVE-2017-12850/): Business logic in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-55011 and fix it if it is affected.

What it is: CVE-2025-55011 is a medium-severity path traversal vulnerability in kanboard, published on 12 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55011 exists.

Affected product: kanboard. 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-2025-55011/ (Markdown: https://insights.sbomify.com/CVE-2025-55011/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-55011
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-55011
- OSV: https://osv.dev/vulnerability/CVE-2025-55011

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-55011/
Summaries are generated and may contain mistakes; the official description above is the record.