CVE-2026-45582— n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters
Possible ATT&CK Techniques 1AI
T1048 · Exfiltration Over Alternative ProtocolAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| czlonkowski | n8n-mcp | < 2.51.3 | affected |
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I. Basic Information for CVE-2026-45582
Vulnerability Information
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Vulnerability Title
n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters
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 2.51.3, the workflow telemetry sanitizer could retain partial fragments of URL-shaped node parameters before sending workflow data to the project's anonymous telemetry backend. Values placed in HTTP-Request-style node parameters — such as customer or tenant identifiers, short secrets embedded in query strings, and signed request parameters — could therefore appear in stored telemetry, contrary to the collection boundary documented in PRIVACY.md. This vulnerability is fixed in 2.51.3.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过发送数据的信息暴露
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| czlonkowski | n8n-mcp | < 2.51.3 | - |
II. Public POCs for CVE-2026-45582
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-45582 (1)
Vendor Advisories for CVE-2026-45582 (1)
Other References for CVE-2026-45582 (1)
IV. Related Vulnerabilities
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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
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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 - 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-201
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V. Comments for CVE-2026-45582
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