Sign In
Advisories

n8n before 1.123.89 Open Redirect via MCP OAuth Dynamic Client Registration

Go back
Severity
medium
Date
Affecting

  • n8n >= 0, < 1.123.89

  • n8n >= 2.46.0, < 2.46.1

  • n8n >= 2.0.0, < 2.45.5

  • n8n >= 3.0.0, < 3.0.1

CWE
  • CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
CVSS
5.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Credit
athul-DarkRange
Description
n8n before 1.123.89, 2.x before 2.45.5, 2.46.x before 2.46.1, and 3.x before 3.0.1 contains an open redirect vulnerability in the unauthenticated MCP OAuth dynamic client registration flow, which accepts arbitrary redirect_uri values via the /mcp-oauth/register endpoint. Attackers can send victims crafted /mcp-oauth/authorize URLs that redirect them to attacker-controlled sites before instance checks run, enabling phishing.

Ready to get Started?

Explore VulnCheck, a next-generation Cyber Threat Intelligence platform, which provides exploit and vulnerability intelligence to help you prioritize and remediate vulnerabilities that matter.
  • Vulnerability Prioritization
    Prioritize vulnerabilities that matter based on the threat landscape and defer vulnerabilities that don't.
  • Early Warning System
    Real-time alerting of changes in the vulnerability landscape so that you can take action before the attacks start.
Schedule a Demo