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CVE-2026-45582— n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters

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.

n8n-MCP是Romuald Członkowski个人开发者的一个连接AI助手与自动化工作流平台的模型上下文协议服务器。 n8n-MCP 2.51.3之前版本存在安全漏洞，该漏洞源于工作流遥测清理器在发送数据前可能保留URL形状节点参数的片段，可能导致HTTP请求样式节点参数中的客户标识符、短密钥和签名请求参数出现在存储遥测中。

CVSS 6.5 · Medium EPSS 0.26% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
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: 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 2.51.3, 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
n8n-MCP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n-MCP是Romuald Członkowski个人开发者的一个连接AI助手与自动化工作流平台的模型上下文协议服务器。 n8n-MCP 2.51.3之前版本存在安全漏洞，该漏洞源于工作流遥测清理器在发送数据前可能保留URL形状节点参数的片段，可能导致HTTP请求样式节点参数中的客户标识符、短密钥和签名请求参数出现在存储遥测中。
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 < 2.51.3 -

II. Public POCs for CVE-2026-45582

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III. Intelligence Information for CVE-2026-45582

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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

Same product: n8n-mcp
Same vendor: czlonkowski
Same weakness: CWE-201

V. Comments for CVE-2026-45582

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