Medium severity · published Jun 24, 2026
CVE-2026-53944
Ghost: Private IP filtering bypass to make server-side requests to internal services
5.8
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GH
Ghost · TryGhost
>= 6.0.9, < 6.21.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53944
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53944
github.com
https://github.com/TryGhost/Ghost/security/advisories/GHSA-wvp2-4qqp-4h3r
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