Secuno
ENNL
Book demo

CVE-2025-66449

C4illin Convertx unrestricted file upload

8.8 HIGHPublic exploitEPSS 0.78%
  1. Published16 Dec 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

C4illin Convertx< 0.16.0

Remediation

Fixed in
C4illin Convertx≥ 0.16.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-821109.6
IBM DataStage on Cloud Pak for Data 5.4.0.0 could allow a remote authenticated attacker…
CVE-2026-821019.6
IBM DataStage on Cloud Pak for Data 5.4.0.0 could allow a remote authenticated attacker…
CVE-2026-196278.2
IBM Planning Analytics 2.0, and 2.1 could allow a remote attacker to read arbitrary…
CVE-2026-1026278.8
IBM TRIRIGA Application Platform 5.0.0 through 5.0.8 could allow a remote authenticated…
CVE-2026-599768.1
ConvertX is a self-hosted file conversion service. Prior to 0.18.0, the ImageMagick…
CVE-2026-859538.5
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7…

Frequently asked

Is CVE-2025-66449 being actively exploited?

CVE-2025-66449 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.78%.

How severe is CVE-2025-66449?

CVE-2025-66449 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.78% probability of exploitation.

Which products are affected by CVE-2025-66449?

Affected products include C4illin Convertx.

How do I fix CVE-2025-66449?

Upgrade affected software to a fixed version, for example C4illin Convertx 0.16.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66449 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.