Vulnerability Report

CVE-2026-35037

Title: SSRF in Ech0 GET /api/website/title endpoint

SSRF

Proof Of Concept

PoC Available for CVE-2026-35037

CWE Category CWE-918

Published Date Apr 06, 2026

Modified Date Apr 22, 2026

Exploit Status Available

Score 7.2 CVSS v3.1

Exploit Probability (EPSS)

0.29%

Vulnerability Summary

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.

Impacted Vendors

ech0 1

Reference Links

https://github.com/lin-snow/Ech0/security/advisories/GHSA-cqgf-f4x7-g6wc

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.2

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns