CVE-2026-77073

Description

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.

References

• https://github.com/n8n-io/n8n/security/advisories/GHSA-vfrj-582q-mvcp
• https://www.vulncheck.com/advisories/n8n-before-cross-project-credential-access-via-mcp