CVE-2026-126386
Published:November 13, 2026
Updated:November 13, 2026
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.
Affected Packages
https://github.com/n8n-io/n8n.git (GITHUB):
Affected version(s) >=n8n@2.0.0-rc.0 <n8n@2.45.5 || >=n8n@2.0.0 <n8n@2.45.5Fix Suggestion:
Update to version n8n@2.45.5https://github.com/n8n-io/n8n.git (GITHUB):
Affected version(s) >=n8n@1.120.0 <n8n@1.123.89Fix Suggestion:
Update to version n8n@1.123.89https://github.com/n8n-io/n8n.git (GITHUB):
Affected version(s) =n8n@2.46.0 <n8n@2.46.1Fix Suggestion:
Update to version n8n@2.46.1n8n (NPM):
Affected version(s) >=2.0.0 <2.45.5 || >=2.0.0-rc.1 <2.45.5Fix Suggestion:
Update to version 2.45.5n8n (NPM):
Affected version(s) =2.46.0 <2.46.1Fix Suggestion:
Update to version 2.46.1n8n (NPM):
Affected version(s) >=1.120.0 <1.123.89Fix Suggestion:
Update to version 1.123.89Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
ACTIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.7
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
URL Redirection to Untrusted Site
EPSS
Base Score:
0.27