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CVE-2025-66449VulnerabilityPublished

CVE-2025-66449: C4illin ConvertX · Path Traversal

Affects C4illin ConvertXSource CVE Database V5

0

Not known to be exploited · CVSS 8.8 High : upgrade to 0.16.0 soon.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.7% chance of exploitation in 30 days – higher than 55% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.16.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Dec 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

Upgrade c4illin/ConvertX to 0.16.0.

Affected software

ProductAffectedFixed in
GitHubc4illin/ConvertXpkg:github/c4illin/ConvertXOther threatsAffected
  • <0.16.0
Fixed in
  • 0.16.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

European organizations should immediately upgrade all ConvertX instances to version 0.16.0 or later to apply the official patch. Until upgrade, implement strict input validation and sanitization on the filename parameter at the application or web server level to prevent path traversal. Restrict file system permissions for the ConvertX service account to limit write access only to necessary directories, preventing overwriting of critical binaries. Employ application-layer firewalls or intrusion detection systems to monitor and block suspicious upload requests. Enforce strong authentication mechanisms, including multi-factor authentication, to reduce risk of credential compromise. Regularly audit file integrity on servers hosting ConvertX to detect unauthorized changes. Additionally, segment the network to isolate file conversion services from sensitive systems and maintain up-to-date backups to enable recovery from potential compromise.

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.

References

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