{"cve":"CVE-2026-35036","nvd":{"published":"2026-04-06T17:17:12.940","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, Ech0 implements link preview (editor fetches a page title) through GET /api/website/title. That is legitimate product behavior, but the implementation is unsafe: the route is unauthenticated, accepts a fully attacker-controlled URL, performs a server-side GET, reads the entire response body into memory (io.ReadAll). There is no host allowlist, no SSRF filter, and InsecureSkipVerify: true on the outbound client. Anyone who can reach the instance can force the Ech0 server to open HTTP/HTTPS URLs of their choice as seen from the server’s network position (Docker bridge, VPC, localhost from the process view). 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:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-918"],"references":["https://github.com/lin-snow/Ech0/security/advisories/GHSA-wc4h-2348-jc3p","https://github.com/lin-snow/Ech0/security/advisories/GHSA-wc4h-2348-jc3p"],"products":["ech0:ech0"],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-35036","score":0.00327,"percentile":0.25538,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-wc4h-2348-jc3p","url":"https://osv.dev/vulnerability/GHSA-wc4h-2348-jc3p","summary":"Ech0 has Unauthenticated Server-Side Request Forgery in Website Preview Feature","modified":"2026-06-25T23:11:13.401132963Z","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-2026-5704","url":"https://osv.dev/vulnerability/GO-2026-5704","summary":"Ech0 has Unauthenticated Server-Side Request Forgery in Website Preview Feature in github.com/lin-snow/ech0","modified":"2026-06-25T23:01:40.008165543Z","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."]}