Arbitrary File Write Vulnerability in ConvertX Affects Multiple Versions
CVE-2025-66449

8.8HIGH

Key Information:

Vendor

C4illin

Status
Convertx
Vendor
CVE Published:
16 December 2025

What is CVE-2025-66449?

ConvertX, a self-hosted online file converter, contains a vulnerability in its upload endpoint that allows an authenticated user to upload files with non-sanitized names. This flaw enables the overwrite of critical system binaries, leading to potential code execution by an attacker. Users are advised to upgrade to version 0.16.0 or later, where this issue has been addressed.

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Affected Version(s)

ConvertX < 0.16.0

References

https://github.com/C4illin/ConvertX/security/advisories/G...
x_refsource_CONFIRM
https://github.com/C4illin/ConvertX/commit/550f472451755d...
x_refsource_MISC
https://github.com/C4illin/ConvertX/blob/4ae2aab66ace7cdc...
x_refsource_MISC

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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