by Kastro
Paper/Archive/CVE-2026-54052

CVE-2026-54052

czlonkowski n8n-mcp — n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments

EPSS 0.4%CVSS 9.9
critical.is priorityof 100
36
CVSS 9.9 (CNA, NVD agree)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 32.9.329 × 206.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
n8n-mcp< 2.56.1–CNA

Scores by source

GitHub_M (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
NVD9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/czlonkowski/n8n-mcp/security/advisories/GHSA-j6r7-6fhx-77wxrefgithub.com/czlonkowski/n8n-mcp/releases/tag/v2.56.1