{"id":"CVE-2026-53948","revision":"bac689743ceb4ad5ac0d3b9c78db90af","records":[{"revision":"bac689743ceb4ad5ac0d3b9c78db90af","observedAt":"2026-10-25T13:17:22.268+00:00","statement":{"source":"nvd","id":"CVE-2026-53948","aliases":[],"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":"2026-06-24T19:17:12.46+00:00","modifiedAt":"2026-06-25T16:07:28.73+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4,"severity":"MEDIUM"}],"references":["https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53948","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-434"],"productCriteria":[],"sourceDates":{"published":"2026-06-24T19:17:12.460","lastModified":"2026-06-25T16:07:28.730"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-53948","identifiers":["CVE-2026-53948"]},"retained":false,"historicalAffected":[]}],"coverage":[]}