CVE-2026-53945

Ghost: Server-side request forgery via DNS rebinding in external request handling

State: Published
Severity: 4.0 Medium
Published: Jun 24, 2026
Updated: Jun 25, 2026
Reserved: Jun 11, 2026

Description

Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, Ghost’s private-IP check for outbound HTTP requests could be bypassed via DNS rebinding, allowing an attacker to coerce the Ghost server into reaching hosts on internal networks through features that issue external fetches. This vulnerability is fixed in 6.21.1.

Scores

CVSS	Score	Vector	Source
3.1	4.0 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N	GitHub_M

Weaknesses

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
GhostTryGhost	>= 6.0.9, < 6.21.1Affected

References

https://github.com/TryGhost/Ghost/security/advisories/GHSA-ch52-px8q-f22j

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