CVE-2026-53944
Ghost: Private IP filtering bypass to make server-side requests to internal services
5.8
MEDIUM
CVSS 3.1
EPSS 0.20%
Description
Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, when making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address. This vulnerability is fixed in 6.21.1.
How to fix CVE-2026-53944
To remediate CVE-2026-53944, upgrade the affected package to a fixed version below.
- —upgrade to 6.21.1 or later
Is CVE-2026-53944 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 6.0.9, < 6.21.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |