Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata
56Vexday Risk Score
Patch soon. It has a working public exploit.
ssvc Attendcvss 7.2epss 0.6%
from disclosure to weapon44 days
Published on NVDApr 6
1st PoC+44d
exploitation probability
0.6%top 52% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Affected products
lin-snow · Ech0public PoCs found — 1
githubgithub.com/fineman999/POC_CVE-2026-35037★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.