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CVE Vulnerability Details :

CVE-2026-53948

PUBLISHED

More Info Official Page

Assigner-GitHub_M

Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa

Published At-24 Jun, 2026 | 18:06

Updated At-25 Jun, 2026 | 13:17

▼CVE Numbering Authority (CNA)

Ghost: File Upload Content-Type Spoofing

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 Products

Vendor

TryGhost

Product

Ghost

Versions

Affected

>= 6.19.4, < 6.21.1

Problem Types

Type	CWE ID	Description
CWE	CWE-434	CWE-434: Unrestricted Upload of File with Dangerous Type

Type: CWE

CWE ID: CWE-434

Description: CWE-434: Unrestricted Upload of File with Dangerous Type

Metrics

Version	Base score	Base severity	Vector
3.1	5.4	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Version: 3.1

Base score: 5.4

Base severity: MEDIUM

Vector:

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

Hyperlink	Resource
https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr	x_refsource_CONFIRM

Hyperlink: https://github.com/TryGhost/Ghost/security/advisories/GHSA-944x-pm95-3jpr

Resource:

x_refsource_CONFIRM

▼Authorized Data Publishers (ADP)

CISA ADP Vulnrichment

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Affected

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Replaced By

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Affected Products

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References