CVE-2026-53944: Tryghost Ghost

Medium severity, CVSS 5.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Tryghost Ghost: from 6.0.9, before 6.21.1 (fixed in 6.21.1)

Published 2026-06-24. Last modified 2026-06-25.