CVE-2026-55608— n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode
Possible ATT&CK Techniques 1AI
T1530 · Data from Cloud StorageAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
- CVE-2026-54052
n8n-MCP: Cross-tenant access to workflow version backups in - CVE-2026-45582
n8n-MCP: Workflow telemetry sanitizer could retain partial v - CVE-2026-45707
n8n-MCP: Multi-tenant MCP requests fall back to process-leve - CVE-2026-44694
n8n-MCP: Authenticated SSRF in n8n-mcp webhook and API clien - CVE-2026-42282
n8n-MCP: Sensitive MCP tool-call arguments logged on authent
Same vendor: czlonkowski
- CVE-2026-54052
n8n-MCP: Cross-tenant access to workflow version backups in - CVE-2026-45582
n8n-MCP: Workflow telemetry sanitizer could retain partial v - CVE-2026-45707
n8n-MCP: Multi-tenant MCP requests fall back to process-leve - CVE-2026-44694
n8n-MCP: Authenticated SSRF in n8n-mcp webhook and API clien - CVE-2026-42282
n8n-MCP: Sensitive MCP tool-call arguments logged on authent
Same weakness: CWE-200
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V. Comments for CVE-2026-55608
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