Is this vulnerability remotely exploitable over the internet?

Yes, if the Ech0 instance is exposed over the internet (or any untrusted network) and the `/api/website/title` endpoint is reachable, an unauthenticated attacker can trigger SSRF by sending crafted URLs.

Does exploitation require authenticated access or a valid user account?

No. The vulnerable link preview route is described as unauthenticated, so any party that can connect to the Ech0 server's HTTP interface can attempt to exploit it.

What is the safest general fix pattern for developers?

The strongest fix pattern is to treat user-supplied URLs as untrusted and only allow server-side fetches to a tightly controlled set of external domains, combined with robust IP/host validation, proper TLS verification, and conservative resource limits. Where possible, route previews through a constrained, sandboxed service that has limited network access.

Severity:

HIGH RISK

(7.5)

Server-Side Request Forgery (CWE-918) in Ech0 Link Preview Endpoint

CVE-2026-35036

Published:

Apr 6, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Network Pivoting and Internal Service Enumeration via SSRF

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Network Pivoting and Internal Service Enumeration via SSRF

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Server-Side Request Forgery (CWE-918) in Ech0 Link Preview Endpoint

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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