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CVE-2025-66449

ConvertX has Path Traversal that leads to Arbitrary File Write and Arbitrary Code Execution

8.8 High

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.78%Up 0.7 points since Dec 16, 2025
90%50%10%1%

What each source reports

CVE List Score used 8.8

ConvertX has Path Traversal that leads to Arbitrary File Write and Arbitrary Code Execution

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.

Record
CVE-2025-66449
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-22, CWE-73, CWE-434
Updated
2026-11-02
EUVDEUVD-2025-203483 8.8

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.

Record
EUVD-2025-203483
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
NVD 8.8

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.

Record
CVE-2025-66449
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-22, CWE-73, CWE-434
Updated
2026-11-02
OSV 8.8

ConvertX has Path Traversal that leads to Arbitrary File Write and Arbitrary Code Execution

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.

Record
CVE-2025-66449
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-22, CWE-434, CWE-73
Updated
2026-11-02

Affected products

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-66449 is a high vulnerability (CVSS 8.8) in C4illin Convertx, published December 16, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.78%, the 56th percentile. No source names a fixed version.

References

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