CVE-2026-53946: CWE-918: Server-Side Request Forgery (SSRF) in TryGhost Ghost
Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, when re-rendering posts, Ghost would refetch missing image dimensions by issuing an outbound HTTP request to the URL stored on an image card — without restricting that URL to trusted image hosts. An authenticated staff user able to create or edit posts could therefore point an image card at an attacker-chosen host and cause the Ghost server to request it on their behalf, including hosts on internal networks or cloud instance metadata endpoints that would not normally be reachable from the public internet. This vulnerability is fixed in 6.21.1.
AI Analysis
Technical Summary
CVE-2026-53946 is a Server-Side Request Forgery (SSRF) vulnerability in TryGhost Ghost CMS versions >=6.19.4 and <6.21.1. When re-rendering posts, Ghost attempts to refetch missing image dimensions by issuing outbound HTTP requests to URLs stored on image cards without restricting these URLs to trusted hosts. An authenticated staff user with post creation or editing privileges can exploit this to make the Ghost server perform HTTP requests to attacker-controlled or internal network hosts, potentially accessing resources not normally reachable from the public internet. This vulnerability is resolved in Ghost version 6.21.1.
Potential Impact
An authenticated staff user can leverage this SSRF vulnerability to make the Ghost server send HTTP requests to arbitrary URLs, including internal network resources or cloud instance metadata endpoints. This could lead to unauthorized information disclosure or internal network reconnaissance. The CVSS score is 5.4 (medium severity), reflecting limited impact due to the requirement for authenticated staff privileges and user interaction.
Mitigation Recommendations
Upgrade Ghost to version 6.21.1 or later, where this SSRF vulnerability is fixed. There is no indication of alternative mitigations or temporary fixes. Patch status is confirmed by the vendor advisory stating the issue is resolved in 6.21.1.
CVE-2026-53946: CWE-918: Server-Side Request Forgery (SSRF) in TryGhost Ghost
Description
Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, when re-rendering posts, Ghost would refetch missing image dimensions by issuing an outbound HTTP request to the URL stored on an image card — without restricting that URL to trusted image hosts. An authenticated staff user able to create or edit posts could therefore point an image card at an attacker-chosen host and cause the Ghost server to request it on their behalf, including hosts on internal networks or cloud instance metadata endpoints that would not normally be reachable from the public internet. This vulnerability is fixed in 6.21.1.
CVSS v3.1
Score 5.4medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53946 is a Server-Side Request Forgery (SSRF) vulnerability in TryGhost Ghost CMS versions >=6.19.4 and <6.21.1. When re-rendering posts, Ghost attempts to refetch missing image dimensions by issuing outbound HTTP requests to URLs stored on image cards without restricting these URLs to trusted hosts. An authenticated staff user with post creation or editing privileges can exploit this to make the Ghost server perform HTTP requests to attacker-controlled or internal network hosts, potentially accessing resources not normally reachable from the public internet. This vulnerability is resolved in Ghost version 6.21.1.
Potential Impact
An authenticated staff user can leverage this SSRF vulnerability to make the Ghost server send HTTP requests to arbitrary URLs, including internal network resources or cloud instance metadata endpoints. This could lead to unauthorized information disclosure or internal network reconnaissance. The CVSS score is 5.4 (medium severity), reflecting limited impact due to the requirement for authenticated staff privileges and user interaction.
Mitigation Recommendations
Upgrade Ghost to version 6.21.1 or later, where this SSRF vulnerability is fixed. There is no indication of alternative mitigations or temporary fixes. Patch status is confirmed by the vendor advisory stating the issue is resolved in 6.21.1.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-11T15:50:01.281Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3c2387748d17fc4ff2f769
Added to database: 06/24/2026, 18:35:51 UTC
Last enriched: 07/01/2026, 22:37:06 UTC
Last updated: 08/04/2026, 12:46:13 UTC
Views: 58
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