Arbitrary File Upload Affecting github.com/lin-snow/ech0/internal/middleware package, versions <4.4.3
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Proof of Concept
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMLINSNOWECH0INTERNALMIDDLEWARE-16321160
- published29 Apr 2026
- disclosed10 Apr 2026
- creditoffset
Introduced: 10 Apr 2026
CVE NOT AVAILABLE CWE-434 Â (opens in a new tab)Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade github.com/lin-snow/Ech0/internal/middleware to version 4.4.3 or higher.
Overview
Affected versions of this package are vulnerable to Arbitrary File Upload via the file upload. An administrator can execute arbitrary JavaScript in the context of the application by uploading a crafted SVG or HTML file containing malicious scripts, which are then served to users without authentication or proper content-type validation.