Vulnerability · Published Oct 5, 2026 · Assigned by GitHub_M

CVE-2026-105648Ghost: Private IP Filtering Bypass via IPv6 Transition Addresses

Medium 4.0

In plain English

A medium-severity server-side request forgery in Ghost from TryGhost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.0Medium

Exploit odds (30 days)0.3%top 77.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Ghost is a Node.js content management system. From 6.0.9 until 6.65.0, a validation issue allowed some functionality, such as Webmentions, to be abused by an unauthenticated user to make limited HTTP requests to hosts in the Ghost server's internal network on some network configurations. A successful attack would not result in any response data being returned. This issue is fixed in version 6.65.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	ghost	6.65.0	GHSA-r7f2-6fj8-6fg2

Affected products (as reported)

Vendor	Product	Versions
TryGhost	Ghost	>= 6.0.9, < 6.65.0

Weakness: CWE-184, CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

References

https://github.com/TryGhost/Ghost/security/advisories/GHSA-r7f2-6fj8-6fg2 x_refsource_CONFIRM
https://github.com/TryGhost/Ghost/pull/30917 x_refsource_MISC
https://github.com/TryGhost/Ghost/commit/20d3f792bf4a7c349ee56b746a067550d8684ff5 x_refsource_MISC
https://github.com/TryGhost/Ghost/releases/tag/v6.65.0 x_refsource_MISC