CVE-2026-126386
n8n before 1.123.89 Open Redirect via MCP OAuth Dynamic Client Registration
CVSS Score
4.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-601 |
| Vendor | n8n-io |
| Product | n8n |
| Published | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
n8n-io / n8n
0 < 1.123.89
n8n-io / n8n
2.46.0 < 2.46.1
n8n-io / n8n
2.0.0 < 2.45.5
n8n-io / n8n
3.0.0 < 3.0.1
References
Credits
🔍 athul-DarkRange