🛡️ CVE-2026-45582 — n8n-mcp

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-201 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

Summary

In affected versions of n8n-mcp, 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.

Impact

Operators with access to the project's telemetry backend could read partial fragments of workflow URL parameters that should not have been collected. The bug was scoped to URL-shaped fields in workflow *definitions*; credentials, OAuth tokens, and workflow *execution* data are not affected — credentials are removed by a separate code path, and long secrets and known-provider tokens are matched by dedicated patterns.

Patches

Fixed in n8n-mcp 2.51.3. Upgrading is the recommended remediation.

Workarounds

For users who cannot upgrade immediately, disable anonymous telemetry by setting any of these environment variables to true:

  • N8N_MCP_TELEMETRY_DISABLED
  • TELEMETRY_DISABLED
  • DISABLE_TELEMETRY

Credit

Reported by @u-ktdi.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Affected software

CVE-2026-45582 is recorded against 2 packages.

  • n8n-mcp
  • unknown

Timeline and source

Published on 18 May 2026 and last revised on 21 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE CWE-201
Public Exploit ✅ No
Source NVD
Published 2026-05-18
Updated 2026-08-12
Modified 2026-07-21

Affected Packages

Software From version Fixed in
n8n-mcp — —
unknown — —

Similar Threats

Vulnerability Monitoring

Track new vulnerabilities in n8n-mcp

CVE-2026-45582 is rated CVSS 6.5 Medium. BotEraser monitors your WordPress installation and notifies you when software you use appears in our vulnerability database.

Set Up Free Alerts →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.