CVE-2026-35037

Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata

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

lin-snow · Ech0

CVSS v3.1 GITHUB

7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS

0.72% chance of exploitation in the next 30 days, 53rd percentile

Nuclei

high · CWE-918

Published

2026-04-06

Proof-of-concept exploits (2)

• advisories/GHSA-cqgf-f4x7-g6wc
• fineman999/POC_CVE-2026-350370★ · 2026-05-20

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-35037.yaml

Security advisories

• lin-snow/Ech0/security/advisories/GHSA-cqgf-f4x7-g6wc

References

• CVE Record
• NVD entry

Related

• CVE-2024-36420
• CVE-2026-42589