CVE-2025-66449

HIGH
Published Dec 16, 2025 Modified Jan 7, 2026 CWE-22 CWE-73 CWE-434

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.

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CVSS v3.1 Score

8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-22 Path Traversal
CWE-73 CWE-73
CWE-434 Unrestricted Upload

Affected Products

Vendor Product
c4illin convertx

References

Frequently Asked Questions

What is CVE-2025-66449? +
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. It has a CVSS v3.1 base score of 8.8 (HIGH).
How severe is CVE-2025-66449? +
CVE-2025-66449 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2025-66449? +
CVE-2025-66449 affects products from c4illin, specifically: convertx. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-66449? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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