Improper Handling of Alternate Encoding Affecting ghost package, versions <6.20.0
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 applications- Snyk IDSNYK-JS-GHOST-21694006
- published24 Oct 2026
- disclosed1 Oct 2026
- creditUnknown
Introduced: 1 Oct 2026
NewCVE-2026-103276 (opens in a new tab)How to fix?
Upgrade ghost to version 6.20.0 or higher.
Overview
ghost is a publishing platform
Affected versions of this package are vulnerable to Improper Handling of Alternate Encoding via URL-encoded path traversal in file extension filtering, which allows an unauthenticated attacker to bypass extension validation and read theme templates and metadata. By sending requests with URL-encoded characters, an attacker can circumvent the file extension checks and access sensitive theme files that should be restricted.