CVE-2026-42230

Published: Mag 04, 2026 Last Modified: Mag 04, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 5,1
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: active
Confidentiality: N/A
Integrity: N/A
Availability: N/A

Description

AI Translation Available

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.

601

URL Redirection to Untrusted Site ('Open Redirect')

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Access Control Confidentiality Other
Potential Impacts:
Bypass Protection Mechanism Gain Privileges Or Assume Identity Other
Applicable Platforms
Technologies: Web Based, Web Server
Likelihood of Exploit: Low
View CWE Details
https://github.com/n8n-io/n8n/security/advisories/GHSA-f6x8…
https://github.com/n8n-io/n8n/security/advisories/GHSA-f6x8-65q6-j9m9