Vulnerability Details 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. 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 21.8%
CVSS Severity
CVSS v3 Score 4.3