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CVE-2026-54052n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an authenticated tenant to read workflow version snapshots belonging to other tenants and delete or destroy other tenants' stored backups, including full node definitions, credential references, and authorization headers. This issue is fixed in version 2.56.1.

9.9 CRITICALEPSS 0.38%Not in KEVNVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
9.9CRITICAL3.1GitHub_M (CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Details

CVE ID
CVE-2026-54052
Status
Analyzed
Assigner (CNA)
GitHub_M
Published
Jul 15, 2026
Last modified
2026-10-24 21:10 UTC
Weaknesses
  • CWE-639 · Authorization Bypass Through User-Controlled Key
  • CWE-862 · Missing Authorization

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 08:34 UTC.