Stored Cross-Site Scripting Vulnerability in Ech0 Product by Lin Snow
CVE-2026-79663

4.8MEDIUM

Key Information:

Vendor

Lin-snow

Status
Ech0
Vendor
CVE Published:
25 August 2026

What is CVE-2026-79663?

Ech0, prior to version 4.7.3, is susceptible to a stored cross-site scripting flaw located in the public RSS feed. This vulnerability occurs due to the lack of HTML escaping for tag names and markdown content, allowing attackers with administrative privileges to introduce malicious tag names or raw HTML. Consequently, any improperly sanitized content can execute JavaScript in RSS readers that support HTML rendering, potentially impacting anonymous subscribers and other users. It is crucial for users to upgrade to the latest version to mitigate the associated risks.

Affected Version(s)

Ech0 0 < 4.7.3

Ech0 4.7.3

References

https://github.com/lin-snow/Ech0/security/advisories/GHSA...
vendor-advisory
https://www.vulncheck.com/advisories/ech0-before-stored-x...
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

adrgs
aisafe-bot
.