CVE-2026-55608CWE-200CWE-863

n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode

Medium · published July 15, 2026

CVSS v3.1
4.2
EPSS
0%
Percentile
19.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.2 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00280 · 19.4th percentile
Weaknesses
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor; CWE-863 · Incorrect Authorization
Published
2026-07-15T20:35Z
EPSS history
Timeline
  • 15 JUL 20:35Z
    n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode
    cvelistv5