Security Advisory

CVE-2026-53948

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-24 18:06:30

Last updated 2026-06-25 13:17:23

Assigner GitHub_M

CVSS score 5.4

State PUBLISHED

Description

Ghost is a Node.js content management system. From 6.19.4 until 6.21.1, insufficient validation of the client-supplied Content-Type on Ghost's Admin API file upload endpoint allowed uploaded files to be served from the site with an attacker-chosen content type on S3/GCS storage backends. On installations that serve uploaded files from the same origin as the site, this could have been used to facilitate stored cross-site scripting against site visitors or staff. This vulnerability is fixed in 6.21.1.

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