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CVE-2026-35037— Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata

Quick assessment

Affected
lin-snow Ech0
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ech0是L1nSn0w个人开发者的一个自托管个人微博客平台。 Ech0 4.2.8之前版本存在代码问题漏洞，该漏洞源于GET /api/website/title端点未经验证即向任意URL发起服务器端HTTP请求，可能导致攻击者访问内部网络服务、云元数据端点或本地服务。

CVSS 7.2 · High EPSS 0.62% · P48

Public Exploits 1

Nuclei · 1 CVE-2026-35037.yaml [template]
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I. Basic Information for CVE-2026-35037

Vulnerability Information
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Vulnerability Title
Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata
Source: CVE Program / CVE List V5
Vulnerability Description
Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to 4.2.8, the GET /api/website/title endpoint accepts an arbitrary URL via the website_url query parameter and makes a server-side HTTP request to it without any validation of the target host or IP address. The endpoint requires no authentication. An attacker can use this to reach internal network services, cloud metadata endpoints (169.254.169.254), and localhost-bound services, with partial response data exfiltrated via the HTML <title> tag extraction This vulnerability is fixed in 4.2.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Ech0 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ech0是L1nSn0w个人开发者的一个自托管个人微博客平台。 Ech0 4.2.8之前版本存在代码问题漏洞，该漏洞源于GET /api/website/title端点未经验证即向任意URL发起服务器端HTTP请求，可能导致攻击者访问内部网络服务、云元数据端点或本地服务。
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 < 4.2.8 -

II. Public POCs for CVE-2026-35037

# POC Description Source Link Shenlong Link
1 Ech0 before 4.2.8 exposes an unauthenticated SSRF vulnerability in GET /api/website/title. The website_url query parameter is fetched server-side without validating the target host or IP address. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-35037.yaml POC Details
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III. Intelligence Information for CVE-2026-35037

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Vendor Advisories for CVE-2026-35037 (1)

IV. Related Vulnerabilities

Same product: Ech0
Same vendor: lin-snow
Same weakness: CWE-918

V. Comments for CVE-2026-35037

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