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.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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.
Which versions are affected by CVE-2025-66449?
It affects 1 product.
Products include 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.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
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
Sources
Also known as GHSA-cpww-gwgc-p72r.