CVE-2026-54052

critical · 9.9

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

CVSS

0.4%

EPSS (exploit prob.)

33rd

EPSS percentile

2026-07-15

Published

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Weaknesses

CWE-639CWE-862

Affected products

Vendor	Product	Affected versions
n8n-mcp	n8n-mcp	< 2.56.1

Check a specific version with /api/v1/cve/match.

References

https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.56.1
https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-j6r7-6fhx-77wx

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-54052