CVE-2025-66449 HIGH

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

Vendor C4Illin
Product ConvertX
Weakness CWE-22 · Path traversal
Published December 16, 2025
Last update December 16, 2025

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 16, 2025 CVE published
December 16, 2025 Record updated