| Package | Affected versions | Patched versions |
|---|---|---|
| n8n | = 2.34.0< 2.33.4 | 2.33.4 |
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.
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