Description
Ech0 before 4.7.3 contains a stored cross-site scripting vulnerability in the public RSS feed where tag names and markdown content are rendered without HTML escaping. Attackers with admin privileges can inject malicious tag names or raw HTML in echo content that executes as JavaScript in RSS readers that render HTML-type summaries, affecting anonymous subscribers and other users.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| lin-snow | Ech0 | < 4.7.3 | 4.7.3 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/lin-snow/Ech0 | < 1.4.8-0.20260503035519-fd320fe3e902 | 1.4.8-0.20260503035519-fd320fe3e902 | GHSA-3v85-fqvh-7rxf |
| Go | github.com/lin-snow/ech0 | < 1.4.8-0.20260503035519-fd320fe3e902 | 1.4.8-0.20260503035519-fd320fe3e902 | GO-2026-5100 |
References
- GitHub Security Advisory (GHSA-3v85-fqvh-7rxf) vendor-advisory
- VulnCheck Advisory: Ech0 before 4.7.3 Stored XSS via RSS feed tag names third-party-advisory