{"cve":"CVE-2026-35037","nvd":{"published":"2026-04-06T17:17:13.093","modified":"2026-10-24T13:10:00.147","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","score":7.2},"cwes":["CWE-918"],"references":["https://github.com/lin-snow/Ech0/security/advisories/GHSA-cqgf-f4x7-g6wc"],"products":["ech0:ech0"],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-35037","score":0.00618,"percentile":0.49302,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-cqgf-f4x7-g6wc","url":"https://osv.dev/vulnerability/GHSA-cqgf-f4x7-g6wc","summary":"Ech0: Unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata","modified":"2026-06-25T19:56:20.608116995Z","packages":[{"ecosystem":"Go","name":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","ranges":["<1.4.8-0.20260401031029-4ca56fea5ba4"],"fixed":["1.4.8-0.20260401031029-4ca56fea5ba4"]}]},{"id":"GO-2026-5331","url":"https://osv.dev/vulnerability/GO-2026-5331","summary":"Ech0: Unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata in github.com/lin-snow/ech0","modified":"2026-06-25T19:45:30.542617271Z","packages":[{"ecosystem":"Go","name":"github.com/lin-snow/ech0","purl":"pkg:golang/github.com/lin-snow/ech0","ranges":["<1.4.8-0.20260401031029-4ca56fea5ba4"],"fixed":["1.4.8-0.20260401031029-4ca56fea5ba4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}