CVE-2026-55608: n8n-Mcp

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.57.4, multi-tenant HTTP mode with ENABLE_MULTI_TENANT=true could allow an authenticated tenant to access default-scope workflow_versions backups instead of being confined to the tenant scope, exposing or deleting workflow-version backups from prior single-tenant deployments or migrations. This issue is fixed in version 2.57.4.

Affected products

• n8n-Mcp n8n-Mcp: before 2.57.4 (fixed in 2.57.4)

Published 2026-07-15. Last modified 2026-07-17.