Medium severity5.4NVD Advisory· Published Jun 24, 2026· Updated Jun 25, 2026
CVE-2026-53948
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'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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
ghostnpm | >= 6.19.4, < 6.21.1 | 6.21.1 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-944x-pm95-3jprghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-53948ghsaADVISORY
- github.com/TryGhost/Ghost/commit/d659e752d6636144d75b9aa94062cdbc88a16b21ghsaWEB
- github.com/TryGhost/Ghost/pull/26751ghsaWEB
- github.com/TryGhost/Ghost/releases/tag/v6.21.1ghsaWEB
- github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jprnvdWEB
News mentions
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