lin-snow Ech0 up to 4.2.7 Endpoint /api/website/title website_url server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, has been found in lin-snow Ech0 up to 4.2.7. The impacted element is an unknown function of the file /api/website/title of the component Endpoint. This manipulation of the argument website_url causes server-side request forgery. This vulnerability is registered as CVE-2026-35037. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in lin-snow Ech0 up to 4.2.7. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file /api/website/title of the component Endpoint. The manipulation of the argument website_url with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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 tag extraction This vulnerability is fixed in 4.2.8.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-35037 since 03/31/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 4.2.8 eliminates this vulnerability.

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Productinfo

Vendor

• lin-snow

Name

• Ech0

Version

• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5
• 4.2.6
• 4.2.7

Website

• Product: https://github.com/lin-snow/Ech0/

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