Moderate severityNVD Advisory· Published Jul 15, 2026· Updated Jul 17, 2026
n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode
CVE-2026-55608
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 packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
n8n-mcpnpm | < 2.57.4 | 2.57.4 |
Affected products
1- Range: <2.57.4
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-2cf7-hpwf-47h9ghsaADVISORY
- github.com/czlonkowski/n8n-mcp/commit/1f42899749ed0c584fb6b4fd63d75233c3edee59mitrex_refsource_MISC
- github.com/czlonkowski/n8n-mcp/commit/c1ca1e73697feaec5ec2a5fb7e6992a2892b62c9ghsaWEB
- github.com/czlonkowski/n8n-mcp/releases/tag/v2.57.4ghsax_refsource_MISCWEB
- github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9ghsax_refsource_CONFIRMWEB
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