CVE-2026-53944

MEDIUM

Ghost: Private IP filtering bypass to make server-side requests to internal services

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 5.8
EPSS 0.0020
EPSS Percentile 9.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-184 CWE-918
Status published
Products (1)
TryGhost/Ghost >= 6.0.9, < 6.21.1
Published Jun 24, 2026
Tracked Since Jun 25, 2026