{"id":"EUVD-2026-39021","revision":"5ab45aaf61db454da1c0a07faca47c2e","records":[{"revision":"5ab45aaf61db454da1c0a07faca47c2e","observedAt":"2026-10-28T08:06:46.996+00:00","statement":{"source":"euvd","id":"EUVD-2026-39021","aliases":["CVE-2026-53948","GHSA-944x-pm95-3jpr"],"title":"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…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4,"severity":null}],"references":["https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-39021","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 24, 2026, 6:06:30 PM","dateUpdated":"Jun 25, 2026, 1:17:23 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-39021","identifiers":["EUVD-2026-39021","CVE-2026-53948","GHSA-944x-pm95-3jpr"]},"retained":false,"historicalAffected":[]}],"coverage":[]}