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

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Summary

CVECVE-2026-45582
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-29 14:16:30 UTC
Updated2026-05-29 14:16:30 UTC
Descriptionn8n-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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-201 | CWE-201 CWE-201: Insertion of Sensitive Information Into Sent Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Czlonkowski N8n-mcp affected < 2.51.3 Not specified

References

ReferenceSourceLinkTags
github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3 [email protected] github.com
github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931... [email protected] github.com
github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w [email protected] github.com
github.com/czlonkowski/n8n-mcp/pull/782 [email protected] github.com
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