{"id":"BIT-ghost-2026-53948","summary":"Ghost: File Upload Content-Type Spoofing","details":"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.","aliases":["CVE-2026-53948","GHSA-944x-pm95-3jpr"],"modified":"2026-07-08T08:11:31.452236613Z","published":"2026-06-30T23:39:24.628Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:ghost:ghost:*:*:*:*:*:node.js:*:*"]},"references":[{"type":"WEB","url":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53948"}],"affected":[{"package":{"name":"ghost","ecosystem":"Bitnami","purl":"pkg:bitnami/ghost"},"ranges":[{"type":"SEMVER","events":[{"introduced":"6.19.4"},{"fixed":"6.21.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/ghost/BIT-ghost-2026-53948.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"}]}],"schema_version":"1.7.5"}