CVE-2026-55608 | n8n-MCP is an MCP server that provides AI assistants access … | CVSS 4.2 MEDIUM

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.

Metadata

CVE ID: CVE-2026-55608
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-16 23:31 UTC
Published: 2026-07-15 20:35 UTC
Last updated: 2026-07-15 20:35 UTC
Primary CWE: CWE-200
CWE-200: Exposure of Sensitive Information to an Unauthorize…
Vendor / Product: czlonkowski / n8n-mcp
Sources: cve.org · NVD

Severity & Metrics

4.2 MEDIUM CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
czlonkowski	n8n-mcp	—	< 2.57.4

Weakness (CWE)

CWE	Source	Description
CWE-200	cna	CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
CWE-863	cna	CWE-863: Incorrect Authorization

CVSS scores (1)

Score	Severity	Version	Source	Vector
4.2	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

References (3)

https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9 https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9
https://github.com/czlonkowski/n8n-mcp/commit/1f42899749ed0c584fb6b4fd63d75233c3edee59 https://github.com/czlonkowski/n8n-mcp/commit/1f42899749ed0c584fb6b4fd63d75233c3edee59
https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.57.4 https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.57.4