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CVE-2026-79661— Ech0 before 4.7.3 Unauthenticated fav_count Modification

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 4.5.6及之前版本存在资源管理错误漏洞，该漏洞源于在公共路由组注册的PUT /api/echo/like/:id端点缺乏身份验证和速率限制，未经身份验证的攻击者可通过提供UUID增加任意echo（包括私有echo）的收藏计数，重复请求无去重机制，每次触发数据库写入和四键缓存失效，可能导致数据篡改及数据库和缓存负载过大。

CVSS 6.5 · Medium EPSS 0.43% · P35

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-2026-79661

Vulnerability Information
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Vulnerability Title
Ech0 before 4.7.3 Unauthenticated fav_count Modification
Source: CVE Program / CVE List V5
Vulnerability Description
Ech0 through 4.5.6 registers the PUT /api/echo/like/:id endpoint on the public router group without authentication or rate limiting. Unauthenticated attackers can increment the fav_count counter of any echo (including private echoes) by supplying its UUID, which can be harvested from the public GET /api/echo/page feed. Repeated requests are accepted without deduplication, each triggering a database write and a four-key cache invalidation, allowing attackers to inflate popularity metrics and amplify load on the database and cache. Fixed in 4.7.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
L1nSn0w Ech0 资源管理错误漏洞
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 4.5.6及之前版本存在资源管理错误漏洞，该漏洞源于在公共路由组注册的PUT /api/echo/like/:id端点缺乏身份验证和速率限制，未经身份验证的攻击者可通过提供UUID增加任意echo（包括私有echo）的收藏计数，重复请求无去重机制，每次触发数据库写入和四键缓存失效，可能导致数据篡改及数据库和缓存负载过大。
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-2026-79661

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III. Intelligence Information for CVE-2026-79661

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Vendor Advisories for CVE-2026-79661 (1)

Other References for CVE-2026-79661 (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-2026-79666 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-2026-79663 4.8 MEDIUM Ech0 before 4.7.3 Stored XSS via RSS feed tag names
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-770

V. Comments for CVE-2026-79661

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