CVE-2026-45707— n8n-MCP: Multi-tenant MCP requests fall back to process-level n8n credentials when tenant headers are absent or incomplete
Possible ATT&CK Techniques 1AI
T1078 · Valid AccountsAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| czlonkowski | n8n-mcp | < 2.51.2 | affected |
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I. Basic Information for CVE-2026-45707
Vulnerability Information
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Vulnerability Title
n8n-MCP: Multi-tenant MCP requests fall back to process-level n8n credentials when tenant headers are absent or incomplete
Source: NVD (National Vulnerability Database)
Vulnerability Description
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.2, when ENABLE_MULTI_TENANT=true, the HTTP transport documents that the target n8n instance is selected per-request from x-n8n-url / x-n8n-key headers. Requests that omitted those headers — or supplied only one of them — silently fell back to the process-level N8N_API_URL / N8N_API_KEY credentials configured for the operator's own n8n instance. As a result, an authenticated MCP tenant could cause n8n management calls to execute against the operator's instance instead of its own. This affects HTTP-mode deployments of n8n-mcp that are run as a shared multi-tenant service. Single-tenant deployments (ENABLE_MULTI_TENANT unset or false) are not affected. This vulnerability is fixed in 2.51.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
访问控制不恰当
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| czlonkowski | n8n-mcp | < 2.51.2 | - |
II. Public POCs for CVE-2026-45707
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-45707 (1)
Vendor Advisories for CVE-2026-45707 (1)
IV. Related Vulnerabilities
Same product: n8n-mcp
- CVE-2026-45582
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n8n-MCP: Sensitive MCP tool-call arguments logged on authent - CVE-2026-41495
n8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Req - CVE-2026-42449
n8n-MCP: IPv4-mapped IPv6 addresses bypass SSRF protection i
Same vendor: czlonkowski
- CVE-2026-45582
n8n-MCP: Workflow telemetry sanitizer could retain partial v - 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 - CVE-2026-41495
n8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Req - CVE-2026-42449
n8n-MCP: IPv4-mapped IPv6 addresses bypass SSRF protection i
Same weakness: CWE-284
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