{"id":"EUVD-2026-39021","enisaUuid":"6d17c3a8-dadb-3379-b56e-bccc803556c2","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\u0027s 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.","datePublished":"Jun 24, 2026, 6:06:30 PM","dateUpdated":"Jun 25, 2026, 1:17:23 PM","baseScore":5.4,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","references":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr\n","aliases":"CVE-2026-53948\nGHSA-944x-pm95-3jpr\n","assigner":"GitHub_M","epss":0.23,"enisaIdProduct":[{"id":"a97714e5-d880-399f-b2d2-4dde069f542a","product":{"name":"Ghost","vendor":{"name":"TryGhost"}},"product_version":"6.19.4, \u003c 6.21.1"}],"enisaIdVendor":[{"id":"1c15d9bb-dadb-38a1-abdf-8d379119b280","vendor":{"name":"TryGhost"}}],"enisaIdVulnerability":[{"id":"9c933e26-49a2-3a11-b735-61badddde7e8","vulnerability":{"id":"GHSA-944x-pm95-3jpr","description":"Ghost: File Upload Content-Type Spoofing","datePublished":"Aug 4, 2026, 9:05:39 PM","dateUpdated":"Aug 4, 2026, 9:05:40 PM","baseScore":0.0,"references":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53948\nhttps://github.com/TryGhost/Ghost/pull/26751\nhttps://github.com/TryGhost/Ghost/commit/d659e752d6636144d75b9aa94062cdbc88a16b21\nhttps://github.com/TryGhost/Ghost\nhttps://github.com/TryGhost/Ghost/releases/tag/v6.21.1\n","enisa_id":"EUVD-2026-39021\n","aliases":"GHSA-944x-pm95-3jpr\nCVE-2026-53948\n","epss":0.0,"dataProcessed":"Nov 1, 2026, 2:03:49 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}},{"id":"dd822dd3-4cdd-33ef-a619-9a4d6567e465","vulnerability":{"id":"CVE-2026-53948","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\u0027s 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.","datePublished":"Jun 24, 2026, 6:06:30 PM","dateUpdated":"Jun 25, 2026, 1:17:23 PM","status":"PUBLISHED","baseScore":5.4,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","references":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr\n","enisa_id":"EUVD-2026-39021\n","assigner":"GitHub_M","epss":0.23,"dataProcessed":"Nov 5, 2026, 7:16:59 AM","vulnerabilityProduct":[{"id":"83188d4d-4918-3f0f-993a-04b44186174f","product":{"name":"Ghost","vendor":{"name":"TryGhost"}},"product_version":"6.19.4, \u003c 6.21.1"}],"vulnerabilityVendor":[{"id":"743968bd-815d-3694-9c5c-818763190c2c","vendor":{"name":"TryGhost"}}]}}],"enisaIdAdvisory":[]}