CVE-2026-77073: n8n

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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

• n8n n8n: before 2.33.4 (fixed in 2.33.4); version 2.34.0 only

Published 2026-08-20. Last modified 2026-09-01.