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CVE-2026-41495— n8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Requests

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 2.47.11之前版本存在日志信息泄露漏洞，该漏洞源于HTTP传输模式下POST /mcp端点请求元数据被写入日志，可能导致泄露Bearer令牌、API密钥和JSON-RPC请求负载。

CVSS 5.3 · Medium EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
czlonkowski n8n-mcp < 2.47.11 affected
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I. Basic Information for CVE-2026-41495

Vulnerability Information
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Vulnerability Title
n8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Requests
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 version 2.47.11, when n8n-mcp runs in HTTP transport mode, incoming requests to the POST /mcp endpoint had their request metadata written to server logs regardless of the authentication outcome. In deployments where logs are collected, forwarded to external systems, or viewable outside the request trust boundary (shared log storage, SIEM pipelines, support/ops access), this can result in disclosure of: bearer tokens from the Authorization header, per-tenant API keys from the, x-n8n-key header in multi-tenant setups, JSON-RPC request payloads sent to the MCP endpoint. Access control itself was not bypassed — unauthenticated requests were correctly rejected with 401 Unauthorized — but sensitive values from those rejected requests could still be persisted in logs. This issue has been patched in version 2.47.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过日志文件的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
n8n-MCP 日志信息泄露漏洞
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 2.47.11之前版本存在日志信息泄露漏洞，该漏洞源于HTTP传输模式下POST /mcp端点请求元数据被写入日志，可能导致泄露Bearer令牌、API密钥和JSON-RPC请求负载。
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 < 2.47.11 -

II. Public POCs for CVE-2026-41495

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III. Intelligence Information for CVE-2026-41495

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Vendor Advisories for CVE-2026-41495 (1)

Other References for CVE-2026-41495 (1)

Same Patch Batch · czlonkowski · 2026-05-08 · 3 CVEs total

CVE-2026-42282 4.3 MEDIUM n8n-MCP: Sensitive MCP tool-call arguments logged on authenticated requests in HTTP mode
CVE-2026-44694 n8n-MCP: Authenticated SSRF in n8n-mcp webhook and API client paths

IV. Related Vulnerabilities

Same product: n8n-mcp
Same vendor: czlonkowski
Same weakness: CWE-532

V. Comments for CVE-2026-41495

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