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CVE-2026-79663

Ech0 before 4.7.3 Stored XSS via RSS feed tag names

MEDIUM
4.8
CVSS Score
Published: August 25, 2026 at 11:33 AM UTC
Updated: August 31, 2026 at 08:56 PM UTC
1 product affected across 1 vendorEch0

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ech0· Lin Snow
60%
v < 4.7.3
Vendor states this is fixed in 4.7.3 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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