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CVE-2026-42282— n8n-MCP: Sensitive MCP tool-call arguments logged on authenticated requests in HTTP mode

CVSS 4.3 · Medium EPSS 0.06% · P18
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I. Basic Information for CVE-2026-42282

Vulnerability Information
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Vulnerability Title
n8n-MCP: Sensitive MCP tool-call arguments logged on authenticated requests in HTTP mode
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 2.47.13, when n8n-mcp runs in HTTP transport mode, authenticated MCP tools/call requests had their full arguments and JSON-RPC params written to server logs by the request dispatcher and several sibling code paths before any redaction. When a tool call carries credential material — most notably n8n_manage_credentials.data — the raw values can be persisted in logs. 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 and OAuth credentials sent through n8n_manage_credentials, per-tenant API keys and webhook auth headers embedded in tool arguments, arbitrary secret-bearing payloads passed to any MCP tool. The issue requires authentication (AUTH_TOKEN accepted by the server), so unauthenticated callers cannot trigger it; the runtime exposure is also reduced by an existing console-silencing layer in HTTP mode, but that layer is fragile and the values are still constructed and passed into the logger. This issue has been patched in version 2.47.13.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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 2.47.13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MCP工具调用请求的完整参数和JSON-RPC参数在日志中写入前未进行编辑，可能导致凭据材料泄露。
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

VendorProductAffected VersionsCPESubscribe
czlonkowskin8n-mcp < 2.47.13 -

II. Public POCs for CVE-2026-42282

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III. Intelligence Information for CVE-2026-42282

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

CVE-2026-414955.3 MEDIUMn8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Requests
CVE-2026-44694n8n-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-2026-42282

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