Ghost: File Upload Content-Type Spoofing
Impact
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.
Vulnerable versions
This vulnerability is present in Ghost from v6.19.4 up to v6.21.0.
Patches
v6.21.1 contains a fix for this issue.
How to update
For self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here.
If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.
For more information
If you have any questions or comments about this advisory, email us at security@ghost.org.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | ghost | >= 6.19.4, < 6.21.1 | 6.21.1 |
Referencias
- https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr
- https://nvd.nist.gov/vuln/detail/CVE-2026-53948
- https://github.com/TryGhost/Ghost/pull/26751
- https://github.com/TryGhost/Ghost/commit/d659e752d6636144d75b9aa94062cdbc88a16b21
- https://github.com/TryGhost/Ghost
- https://github.com/TryGhost/Ghost/releases/tag/v6.21.1
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- Debilidad (CWE)
CWE-434- Plataforma
- npm
- Paquete
ghost- Publicada
- 04.08.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-944x-pm95-3jpr - CC BY 4.0
Historial de vulnerabilidades: ghost
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 61
- Primera → última
- 04.2021 10.2026
- Sin corrección
- 3
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 4
- Alta 16
- Media 38
- Baja 3
Divulgaciones por año
- 2021: 5
- 2022: 4
- 2023: 3
- 2024: 3
- 2025: 1
- 2026: 45
-
Ghost: File Upload Content-Type Spoofing esta entrada
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