czlonkowski n8n-mcp up to 2.47.10 MCP Endpoint /mcp log file

Summaryinfo

A vulnerability classified as problematic was found in czlonkowski n8n-mcp up to 2.47.10. Impacted is an unknown function of the file /mcp of the component MCP Endpoint. The manipulation results in log file. This vulnerability is cataloged as CVE-2026-41495. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in czlonkowski n8n-mcp up to 2.47.10. Affected is an unknown function of the file /mcp of the component MCP Endpoint. The manipulation with an unknown input leads to a log file vulnerability. CWE is classifying the issue as CWE-532. Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-41495 since 04/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 2.47.11 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• czlonkowski

Name

• n8n-mcp

Version

• 2.47.0
• 2.47.1
• 2.47.2
• 2.47.3
• 2.47.4
• 2.47.5
• 2.47.6
• 2.47.7
• 2.47.8
• 2.47.9
• 2.47.10

Website

• Product: https://github.com/czlonkowski/n8n-mcp/

CPE 2.3info

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CPE 2.2info

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