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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-944x-pm95-3jprghsaADVISORY
- github.com/TryGhost/Ghost/commit/d659e752d6636144d75b9aa94062cdbc88a16b21ghsa
- github.com/TryGhost/Ghost/pull/26751ghsa
- github.com/TryGhost/Ghost/releases/tag/v6.21.1ghsa
- github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jprnvd
- nvd.nist.gov/vuln/detail/CVE-2026-53948ghsa
News mentions
0No linked articles in our index yet.