CVE-2026-53948 — Ghost: File Upload Content-Type Spoofing
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 all…
Published: 2026-06-24 · CVSS: 5.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7