Vulnerability · Published Apr 6, 2026 · Assigned by GitHub_M
CVE-2026-35036Ech0 Affected by Unauthenticated Server-Side Request Forgery in Website Preview Feature
High 7.5
In plain English
A high-severity server-side request forgery in Ech0 from lin-snow. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/lin-snow/ech0 | 1.4.8-0.20260401031029-4ca56fea5ba4 | GHSA-wc4h-2348-jc3p |
| Go | github.com/lin-snow/ech0 | 1.4.8-0.20260401031029-4ca56fea5ba4 | GO-2026-5704 |
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/lin-snow/Ech0/security/advisories/GHSA-wc4h-2348-jc3p x_refsource_CONFIRM