CVE-2026-45582 Details
Description
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.3, the workflow telemetry sanitizer could retain partial fragments of URL-shaped node parameters before sending workflow data to the project's anonymous telemetry backend. Values placed in HTTP-Request-style node parameters — such as customer or tenant identifiers, short secrets embedded in query strings, and signed request parameters — could therefore appear in stored telemetry, contrary to the collection boundary documented in PRIVACY.md. This vulnerability is fixed in 2.51.3.
A vulnerability in n8n-MCP versions prior to 2.51.3 allows the workflow telemetry sanitizer to improperly handle URL-shaped node parameters. This issue could result in the unintentional retention of sensitive information, such as customer or tenant identifiers, short secrets in query strings, and signed request parameters, which would then be sent to the project's anonymous telemetry backend. The vulnerability contradicts the data collection boundaries outlined in the project's privacy documentation.
Users can upgrade to n8n-MCP version 2.51.3 or later to address this vulnerability. For those unable to upgrade immediately, the anonymous telemetry feature can be disabled by setting the environment variables N8N_MCP_TELEMETRY_DISABLED, TELEMETRY_DISABLED, or DISABLE_TELEMETRY to true.
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 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f | [email protected] | Patch |
| https://github.com/czlonkowski/n8n-mcp/pull/782 | [email protected] | Issue TrackingPatch |
| https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3 | [email protected] | ProductRelease Notes |
| https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w | [email protected] | MitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-201 | Insertion of Sensitive Information Into Sent Data | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| n8n-mcp n8n-mcp | < 2.51.3 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 21, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 1, 2026 | Initial Analysis | [email protected] |
| May 29, 2026 | New CVE Received | [email protected] |