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CVE-2026-45582

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

Published: May 29, 2026Updated: May 29, 2026 Sources: CVE List NVD
NVD MITRE
6.5CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None

Weaknesses

CWE-201

Affected Products

n8n-mcp
czlonkowski

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f
github.com
https://github.com/czlonkowski/n8n-mcp/pull/782
github.com
https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3
github.com
and 1 more references View all →

Timeline

Published
May 29, 2026
Last Updated
May 29, 2026

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