CVE-2026-54052

CRITICAL

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

Title source: cna
STIX 2.1

Description

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.

References (2)

Core 2
Core References

Scores

CVSS v3 9.9
EPSS 0.0023
EPSS Percentile 13.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-639 CWE-862
Status published
Products (2)
czlonkowski/n8n-mcp < 2.56.1
n8n-mcp/n8n-mcp < 2.56.1
Published Jul 15, 2026
Tracked Since Jul 16, 2026