CVE-2026-79663: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in lin-snow Ech0
Description
Ech0 versions before 4.7.3 have a stored cross-site scripting (XSS) vulnerability in the public RSS feed. This flaw allows attackers with admin privileges to inject malicious tag names or raw HTML into echo content, which is rendered without proper HTML escaping. As a result, JavaScript can execute in RSS readers that render HTML summaries, potentially impacting anonymous subscribers and other users.
CVSS v4.0
Score 4.8medium
Affected software
lin-snow
Ech0
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-79663 describes a stored cross-site scripting vulnerability in lin-snow Ech0 prior to version 4.7.3. The vulnerability exists because tag names and markdown content in the public RSS feed are rendered without HTML escaping. Attackers with administrative privileges can exploit this by injecting malicious tag names or raw HTML into echo content. When RSS readers render these HTML-type summaries, the injected JavaScript executes, affecting anonymous subscribers and other users who consume the feed.
Potential Impact
The vulnerability enables attackers with admin privileges to execute arbitrary JavaScript in the context of RSS readers that render HTML summaries. This can lead to unauthorized actions or data exposure for anonymous subscribers and other users viewing the RSS feed. The CVSS 4.0 base score is 4.8 (medium severity), reflecting network attack vector, low complexity, required privileges, and partial user interaction.
Mitigation Recommendations
A fixed version is available as Ech0 4.7.3 or later. Users should upgrade to version 4.7.3 or above to remediate this vulnerability. No additional mitigations are indicated in the provided data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-25T11:09:11.171Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8d820cacd9273b4922540c
Added to database: 08/25/2026, 11:52:44 UTC
Last enriched: 09/10/2026, 19:35:32 UTC
Last updated: 10/10/2026, 18:48:22 UTC
Views: 47
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