CVE-2026-55608

Summary

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 Software

Weaknesses

• CWE-200: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
• CWE-863: CWE-863: Incorrect Authorization

References

• https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9
• https://github.com/czlonkowski/n8n-mcp/commit/1f42899749ed0c584fb6b4fd63d75233c3edee59
• https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.57.4

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