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CVE-2026-45582 n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters

Medium 6.5 Published Updated

The n8n-MCP telemetry sanitizer fails to fully redact sensitive URL parameters, potentially leaking secrets to the telemetry backend.

Exploited in the wild
Not known
Login needed
Any signed-in user
Attackable
Over the internet
Victim action needed
Not needed
Fix
Available

What is CVE-2026-45582?

CVE-2026-45582 is a medium-severity vulnerability in czlonkowski n8n-mcp, published on 29 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-201

Which versions are affected by CVE-2026-45582?

2 open source packages ship an affected version, including n8n-mcp. It affects 1 product.

PackageAffectedFixed in
n8n-mcp npmAll versions2.51.3
n8n-mcp npmAll versions2.51.3

Products include N8n-Mcp N8n-Mcp.

How do I fix CVE-2026-45582?

Upgrade n8n-mcp to 2.51.3 or later.

Is CVE-2026-45582 being exploited?

There is no known exploitation of CVE-2026-45582 in the wild and no public exploit code.

Sources

Also known as GHSA-f3rg-xqjj-cj9w.

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