Server-Side Request Forgery (SSRF) in Ghost - CVE-2026-53946
Published: July 30, 2026
Vulnerability identifier: #VU140538
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2026-53946
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to induce the server to send requests to unintended hosts and disclose limited sensitive information.
The vulnerability exists due to improper access control in the mobiledoc image-size fetch logic when re-rendering posts with image cards that reference user-supplied URLs. A remote user can create or edit a post containing a specially crafted image URL to induce the server to send requests to unintended hosts and disclose limited sensitive information.
The issue can be triggered during post re-rendering when image dimensions are missing, and user interaction is required.
Affected software
Ghost
How to mitigate CVE-2026-53946
Install security update from vendor's website.
Ghost - update to 6.21.1