CVE-2026-41495 Details
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.
A vulnerability in n8n-MCP versions through 2.47.10 allows sensitive request metadata to be logged when the server is running in HTTP transport mode. This logging occurs on incoming POST /mcp requests, regardless of authentication status. As a result, bearer tokens from the Authorization header, per-tenant API keys from the x-n8n-key header in multi-tenant environments, and JSON-RPC request payloads sent to the MCP endpoint can be inadvertently disclosed. While access control was properly enforced by rejecting unauthenticated requests with a 401 status, the sensitive information from these rejected requests was still logged.
Users can upgrade to n8n-MCP version 2.47.11 or later. For those unable to upgrade immediately, it's recommended to restrict network access to the HTTP port or switch to the stdio transport mode, which does not expose an HTTP interface.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.11 | [email protected] | ProductRelease Notes |
| https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-pfm2-2mhg-8wpx | [email protected] | MitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-532 | Insertion of Sensitive Information into Log File | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| n8n-mcp n8n-mcp | < 2.47.11 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 14, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | New CVE Received | [email protected] |