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

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-35037.yaml

Associated Vulnerability

Title: Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata (CVE-2026-35037)
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.

Description

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.

File Snapshot

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