Vulnerability DatabaseCVE-2026-79663
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CVE-2026-79663
Published:August 25, 2026
Updated:September 24, 2026
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 Packages
https://github.com/lin-snow/Ech0.git (GITHUB):
Affected version(s) >=v1.0.0 <v4.7.3
Fix Suggestion:
Update to version v4.7.3
Related Resources (6)
https://github.com/lin-snow/Ech0/security/advisories/GHSA-3v85-fqvh-7rxf
https://github.com/lin-snow/Ech0/commit/fd320fe3e9021c8d8d284fb274775c018690520e
https://github.com/lin-snow/Ech0
https://nvd.nist.gov/vuln/detail/CVE-2026-79663
https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-rss-feed-tag-names
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79663.json
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CVSS v4
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79
EPSS
Base Score:
0.15