CVE-2026-79663
Ech0 before 4.7.3 Stored XSS via RSS feed tag names
- State
- Published
- Severity
- 4.8 Medium
- Published
- Aug 25, 2026
- Updated
- Aug 26, 2026
- Reserved
- Aug 25, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.8 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 4.8 Medium | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Ech0lin-snow |
|
References
- GitHub Security Advisory (GHSA-3v85-fqvh-7rxf)vendor-advisory
- VulnCheck Advisory: Ech0 before 4.7.3 Stored XSS via RSS feed tag namesthird-party-advisory
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