CVE-2026-42230

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.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/n8n-io/n8n/security/advisories/GHSA-f6x8-65q6-j9m9	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:n8n:n8n:::::enterprise:node.js::
	cpe:2.3:a:n8n:n8n:::::enterprise:node.js::
	cpe:2.3:a:n8n:n8n:2.18.0::::enterprise:node.js::*

History

06 May 2026, 14:57

Type	Values Removed	Values Added
CPE		cpe:2.3:a:n8n:n8n:2.18.0::::enterprise:node.js::* cpe:2.3:a:n8n:n8n:::::enterprise:node.js::
First Time		N8n n8n N8n
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.1
References	~~() https://github.com/n8n-io/n8n/security/advisories/GHSA-f6x8-65q6-j9m9 -~~	() https://github.com/n8n-io/n8n/security/advisories/GHSA-f6x8-65q6-j9m9 - Vendor Advisory

04 May 2026, 19:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-04 19:16

Updated : 2026-05-06 14:57

NVD link : CVE-2026-42230

Mitre link : CVE-2026-42230

CVE.ORG link : CVE-2026-42230

JSON object : View

Products Affected

n8n

n8n

CWE

CWE-601

URL Redirection to Untrusted Site ('Open Redirect')

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