CVE-2026-79663CWE-79cross-site-scripting

CVE-2026-79663

Medium · published August 25, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
15.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
4.8 · 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
EPSS
0.00251 · 15.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-25T16:16Z
References (2)
https://github.com/lin-snow/Ech0/security/advisories/GHSA-3v85-fqvh-7rxf · [email protected]https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-rss-feed-tag-names · [email protected]
EPSS history
Timeline
  • 27 AUG 06:46Z
    EPSS moved — → 0%
    epss
  • 25 AUG 11:33Z
    Ech0 before 4.7.3 Stored XSS via RSS feed tag names
    cvelistv5