Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ech0 | Ech0 | < 4.2.8 |
Related Weaknesses (CWE)
References
- https://github.com/lin-snow/Ech0/security/advisories/GHSA-wc4h-2348-jc3pExploitMitigationVendor Advisory
- https://github.com/lin-snow/Ech0/security/advisories/GHSA-wc4h-2348-jc3pExploitMitigationVendor Advisory
FAQ
What is CVE-2026-35036?
CVE-2026-35036 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 le...
How severe is CVE-2026-35036?
CVE-2026-35036 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-35036?
Check the references section above for vendor advisories and patch information. Affected products include: Ech0 Ech0.