Description (CNA)
n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, the /mcp-oauth/register endpoint accepted OAuth client registrations without authentication, allowing arbitrary redirect_uri values to be registered. When a user denies the MCP OAuth consent dialog, the handleDeny handler redirects the user to the registered redirect_uri without validation, enabling an open redirect to an attacker-controlled URL. An attacker can craft a phishing link and send it to a victim; if the victim clicks "Deny" on the consent page, they are silently redirected to an external site. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| n8n-io / n8n | affected < 1.123.32; affected >= 2.17.0, < 2.17.4; affected >= 2.18.0, < 2.18.1 |
CWE
CWE-601
References
ADP enrichment
No English description supplied.
No references supplied.