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CVE-2026-55608— n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode

Quick assessment

Affected
czlonkowski n8n-mcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

czlonkowski n8n-mcp是czlonkowski的MCP 工具。 czlonkowski n8n-mcp 2.57.4之前版本存在安全漏洞，该漏洞源于多租户HTTP模式被绕过受信租户范围，可能导致授权用户访问或删除默认范围内的工作流版本备份。

CVSS 4.2 · Medium EPSS 0.16% · P6

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
czlonkowski n8n-mcp < 2.57.4 affected
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I. Basic Information for CVE-2026-55608

Vulnerability Information
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Vulnerability Title
n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
czlonkowski n8n-mcp 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
czlonkowski n8n-mcp是czlonkowski的MCP 工具。 czlonkowski n8n-mcp 2.57.4之前版本存在安全漏洞，该漏洞源于多租户HTTP模式被绕过受信租户范围，可能导致授权用户访问或删除默认范围内的工作流版本备份。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
czlonkowski n8n-mcp < 2.57.4 -

II. Public POCs for CVE-2026-55608

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III. Intelligence Information for CVE-2026-55608

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Patches & Fixes for CVE-2026-55608 (1)

Vendor Advisories for CVE-2026-55608 (1)

Other References for CVE-2026-55608 (1)

IV. Related Vulnerabilities

Same product: n8n-mcp
Same vendor: czlonkowski
Same weakness: CWE-200

V. Comments for CVE-2026-55608

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