CVE-2026-41495— n8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Requests
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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: 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 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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过日志文件的信息暴露
Source: NVD (National Vulnerability Database)
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 | - |
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- Release Release v2.47.11 · czlonkowski/n8n-mcp · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-41495
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
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n8n-MCP: Sensitive MCP tool-call arguments logged on authent - CVE-2026-41004
VMware Spring Cloud Config 日志信息泄露漏洞 - CVE-2024-30151
HCL BigFix Service Management (SM) is susceptible to Broken - CVE-2026-7824
PaperCut Hive (Ricoh): Plain text password in logs - CVE-2026-40945
Oxia: Bearer token exposed in debug log messages on authenti
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