Arbitrary URL Access Vulnerability in Ech0 Publishing Platform
CVE-2026-35037

7.2HIGH

Key Information:

Vendor

Lin-snow

Status
Ech0
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-35037?

The Ech0 Publishing Platform is susceptible to an arbitrary URL access vulnerability that allows attackers to exploit the GET /api/website/title endpoint. This endpoint accepts arbitrary URLs via the website_url query parameter and executes a server-side HTTP request without validating the host or IP address, requiring no authentication. As a result, attackers can access internal network services and cloud metadata endpoints (e.g., 169.254.169.254), potentially leading to unauthorized data exfiltration through the HTML tag extraction. This issue has been addressed in version 4.2.8.

Affected Version(s)

Ech0 < 4.2.8

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

POC_CVE-2026-35037
Created by fineman999

References

https://github.com/lin-snow/Ech0/security/advisories/GHSA...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.