What’s Vulnerable › Vulnerabilities

CVE-2026-55608: n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-15 · updated 2026-10-24
• Weakness: CWE-200

Description

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

• czlonkowski n8n-mcp: before 2.57.4 — fixed in 2.57.4

How to fix

Upgrade to a fixed version: czlonkowski n8n-mcp 2.57.4. Check the vendor advisory for mitigations.

References

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

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