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CVE-2026-79663— Ech0 before 4.7.3 Stored XSS via RSS feed tag names

Quick assessment

Affected
lin-snow Ech0
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

L1nSn0w Ech0是L1nSn0w个人开发者的一款功能综合的实用工具。 L1nSn0w Ech0 4.7.3之前版本存在跨站脚本漏洞，该漏洞源于在公共RSS feed中标签名称和markdown内容渲染时未进行HTML转义，容易受到存储型跨站脚本攻击，具有管理员权限的攻击者可注入恶意标签名或原始HTML在RSS阅读器中执行JavaScript，影响匿名订阅者和其他用户。

CVSS 4.8 · Medium EPSS 0.25% · P15

Affected Version Matrix 2

VendorProduct Version RangeStatus
lin-snow Ech0 < 4.7.3 affected
4.7.3 unaffected
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I. Basic Information for CVE-2026-79663

Vulnerability Information
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Vulnerability Title
Ech0 before 4.7.3 Stored XSS via RSS feed tag names
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
L1nSn0w Ech0 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
L1nSn0w Ech0是L1nSn0w个人开发者的一款功能综合的实用工具。 L1nSn0w Ech0 4.7.3之前版本存在跨站脚本漏洞，该漏洞源于在公共RSS feed中标签名称和markdown内容渲染时未进行HTML转义，容易受到存储型跨站脚本攻击，具有管理员权限的攻击者可注入恶意标签名或原始HTML在RSS阅读器中执行JavaScript，影响匿名订阅者和其他用户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
lin-snow Ech0 0 ~ 4.7.3 -

II. Public POCs for CVE-2026-79663

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III. Intelligence Information for CVE-2026-79663

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Vendor Advisories for CVE-2026-79663 (1)

News Coverage for CVE-2026-79663 (1)

Same Patch Batch · lin-snow · 2026-08-25 · 16 CVEs total

CVE-2026-79665 8.8 HIGH Ech0 before 4.5.1 Authorization Bypass via Session Tokens
CVE-2026-79662 8.0 HIGH Ech0 before 4.7.3 OAuth Redirect URI Validation Bypass
CVE-2026-79659 7.7 HIGH Ech0 before 4.7.3 Server-Side Request Forgery via fetchPeerConnectInfo
CVE-2026-79667 7.6 HIGH Ech0 before 4.4.3 Authentication Bypass via Scope Enforcement
CVE-2026-79658 7.5 HIGH Ech0 before 5.0.1 Denial of Service via Accept-Language
CVE-2026-79664 7.4 HIGH Ech0 before 4.7.3 Access Token Revocation Bypass
CVE-2026-79673 6.5 MEDIUM Ech0 before 4.4.3 Scope Bypass via profile:read Token
CVE-2026-79661 6.5 MEDIUM Ech0 before 4.7.3 Unauthenticated fav_count Modification
CVE-2026-79666 6.5 MEDIUM Ech0 before 4.4.3 Missing Authorization via dashboard log endpoints
CVE-2026-79672 5.5 MEDIUM Ech0 before 4.4.3 Authentication Bypass via Comment Panel
CVE-2026-79671 5.5 MEDIUM Ech0 before 4.4.3 SSRF via DNS Resolution Bypass
CVE-2026-79660 5.3 MEDIUM Ech0 before 4.7.3 Email Disclosure via Public API
CVE-2026-79668 5.3 MEDIUM Ech0 before 4.7.3 Unauthenticated Like Endpoint Metric Inflation
CVE-2026-79670 4.8 MEDIUM Ech0 before 4.4.3 Stored XSS via SVG Upload
CVE-2026-79669 4.3 MEDIUM Ech0 before 4.4.3 Missing Authorization on System Logs

IV. Related Vulnerabilities

Same product: Ech0
Same vendor: lin-snow
Same weakness: CWE-79

V. Comments for CVE-2026-79663

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