CVE-2026-79663Ech0 before 4.7.3 Stored XSS via RSS feed tag names
Updated under an hour ago ()
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It affects lin-snow Ech0. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Aug 26, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
lin-snow Ech0 lin_snow:ech0 (from the name) | before 4.7.3; 4.7.3 not affected | CNA record |
References
- https://github.com/lin-snow/Ech0/security/advisories/GHSA-3v85-fqvh-7rxfvendor-advisory
- https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-rss-feed-tag-namesthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.