Arbitrary File Upload Affecting ghost package, versions >=4.22.0 <6.65.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Arbitrary File Upload vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-JS-GHOST-21693968
- published24 Oct 2026
- disclosed7 Oct 2026
- credit5255fgh, nhattanhh
Introduced: 7 Oct 2026
NewCVE-2026-105649 (opens in a new tab)How to fix?
Upgrade ghost to version 6.65.0 or higher.
Overview
ghost is a publishing platform
Affected versions of this package are vulnerable to Arbitrary File Upload in the mediaValidation middleware in ghost/core/core/server/web/api/middleware/upload.js, where SVG thumbnail uploads are not checked against the file's MIME content type, only its extension. An authenticated attacker can upload a malicious SVG file with a non-SVG extension (e.g. .jpg) as a media thumbnail, causing storage adapters that serve files by content type (such as S3) to serve the unsanitized SVG as image/svg+xml, enabling stored cross-site scripting.