CVE-2026-79663

MEDIUM 4.8

Ech0 before 4.7.3 Stored XSS via RSS feed tag names

CVSS Score

4.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	lin-snow
Product	ech0
Published	Aug 25, 2026

Stay Ahead of the Next One

Get instant alerts for lin-snow ech0

Be the first to know when new medium vulnerabilities affecting lin-snow ech0 are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

lin-snow / Ech0

0 < 4.7.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/lin-snow/Ech0/security/advisories/GHSA-3v85-fqvh-7rxf vulncheck.com: https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-rss-feed-tag-names

Credits

🔍 adrgs aisafe-bot