# CVE-2025-66449: ConvertX has Path Traversal that leads to Arbitrary File Write and Arbitrary Code Execution

> Authenticated attackers can exploit path traversal in ConvertX to write arbitrary files, overwriting binaries to achieve remote code execution.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** 16 Dec 2025
- **Updated:** 16 Dec 2025
- **Also known as:** GHSA-cpww-gwgc-p72r

## What is CVE-2025-66449?

CVE-2025-66449 is a high-severity path traversal vulnerability in C4illin ConvertX, published on 16 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

ConvertXis a self-hosted online file converter. In versions prior to 0.16.0, the endpoint `/upload` allows an authenticated user to write arbitrary files on the system, overwriting binaries and allowing code execution. The upload function takes `file.name` directly from user supplied data without doing any sanitization on the name thus allowing for arbitrary file write. This can be used to overwrite system binaries with ones provided from an attacker allowing full code execution. Version 0.16.0 contains a patch for the issue.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-73 (External Control of File Name or Path), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2025-66449?

It affects 1 product.


Products: C4illin Convertx.

## How do I fix CVE-2025-66449?

No fix has been published for CVE-2025-66449 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-66449 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66449 exists.

## Other vulnerabilities in C4illin ConvertX

- [CVE-2026-24741](https://insights.sbomify.com/CVE-2026-24741/): ConvertX Vulnerable to Arbitrary File Deletion via Path Traversal in `POST /delete` (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-66449 and fix it if it is affected.

What it is: CVE-2025-66449 is a high-severity path traversal vulnerability in C4illin ConvertX, published on 16 Dec 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-2025-66449 exists.

Affected product: C4illin ConvertX. 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-2025-66449/ (Markdown: https://insights.sbomify.com/CVE-2025-66449/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66449
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66449
- OSV: https://osv.dev/vulnerability/CVE-2025-66449

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66449/
Summaries are generated and may contain mistakes; the official description above is the record.