medium4.3
CVE-2026-77073
n8n versions before 2.34.1 contain a credential validation bypass in the MCP create_workflow_from_code tool when authentication type is set to an expression.
Impact
n8n versions before 2.34.1 contain a credential validation bypass in the MCP create_workflow_from_code tool when authentication type is set to an expression. Attackers with a valid MCP Bearer API key and knowledge of a target credential ID can persist unauthorized cross-project credential references on workflows in different projects.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| N8n | N8n | before 2.33.4 Version 2.34.0 |