CVE-2026-53944 Details
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.
A vulnerability exists in Ghost, a Node.js content management system, versions 6.0.9 prior to 6.21.1. This issue allows for bypassing the IP filter that prevents external requests from reaching internal services. The bypass is achieved by using an IPv6 literal that corresponds to a private IPv4 address.
Users can update to Ghost version 6.21.1, which addresses this vulnerability. For self-hosted instances using Docker, instructions for updating are available in the Ghost documentation. Those using a Ghost-CLI installation can also find update guidance in the official Ghost documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 24, 2026CISA-ADP
Assessed Jun 24, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/TryGhost/Ghost/security/advisories/GHSA-wvp2-4qqp-4h3r | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-184 | Incomplete List of Disallowed Inputs | [email protected] |
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Ghost | >= 6.0.9, <= 6.21.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 24, 2026 | New CVE Received | [email protected] |
| Jun 24, 2026 | CVE Modified | CISA-ADP |