Vulnerability from bitnami_vulndb
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.
{
"affected": [
{
"package": {
"ecosystem": "Bitnami",
"name": "ghost",
"purl": "pkg:bitnami/ghost"
},
"ranges": [
{
"events": [
{
"introduced": "6.19.4"
},
{
"fixed": "6.21.1"
}
],
"type": "SEMVER"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
}
]
}
],
"aliases": [
"CVE-2026-53948"
],
"database_specific": {
"cpes": [
"cpe:2.3:a:ghost:ghost:*:*:*:*:*:node.js:*:*"
],
"severity": "Medium"
},
"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\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.",
"id": "BIT-ghost-2026-53948",
"modified": "2026-07-01T00:07:50.168Z",
"published": "2026-06-30T23:39:24.628Z",
"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"
}
],
"schema_version": "1.6.2",
"summary": "Ghost: File Upload Content-Type Spoofing"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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