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    CVE-2026-35037

    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.

    Published:Apr 6, 2026
    Last Modified:Apr 22, 2026
    EPS:Apr 6, 2026
    EPSS Score:0.00053
    CVSS Score:7.2

    Affected Products

    Vendor
    Ech0
    Product
    Ech0
    Vendor
    Lin-snow
    Product
    Ech0

    Exploits

    https://github.com/lin-snow/Ech0/security/advisories/GHSA-cqgf-f4x7-g6wchttps://github.com/fineman999/POC_CVE-2026-35037

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High