CVE-2026-77073 n8n before 2.34.1 Cross-Project Credential Access via MCP

n8n versions before 2.34.1 contain a credential validation bypass in the MCP createworkflowfromcode 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...

PT-2026-78929

Name of the Vulnerable Software and Affected Versions n8n versions prior to 2.34.1 Description A credential validation bypass exists in the MCP create workflow from code tool when the authentication type is configured as an expression. An attacker possessing a valid MCP Bearer API key and a targe...