Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M
CVE-2026-55608n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode
Medium 4.2
In plain English
A medium-severity information exposure in n8n-mcp from czlonkowski. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | n8n-mcp | 2.57.4 | GHSA-2cf7-hpwf-47h9 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| czlonkowski | n8n-mcp | < 2.57.4 |
Weakness: CWE-200, CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N