Vulnerability · Published Apr 6, 2026 · Assigned by GitHub_M
CVE-2026-35037Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata
High 7.2
In plain English
A high-severity server-side request forgery in Ech0 from lin-snow. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/lin-snow/ech0 | 1.4.8-0.20260401031029-4ca56fea5ba4 | GHSA-cqgf-f4x7-g6wc |
| Go | github.com/lin-snow/ech0 | 1.4.8-0.20260401031029-4ca56fea5ba4 | GO-2026-5331 |
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
References
- https://github.com/lin-snow/Ech0/security/advisories/GHSA-cqgf-f4x7-g6wc x_refsource_CONFIRM