Vulnerability-Lookup

CVE-2026-45582 (GCVE-0-2026-45582)

Vulnerability from cvelistv5 – Published: 2026-05-29 13:37 – Updated: 2026-05-29 18:44

Title

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

Summary

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.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-201 - Insertion of Sensitive Information Into Sent Data

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/czlonkowski/n8n-mcp/security/a…	x_refsource_CONFIRM
https://github.com/czlonkowski/n8n-mcp/pull/782	x_refsource_MISC
https://github.com/czlonkowski/n8n-mcp/commit/6cf…	x_refsource_MISC
https://github.com/czlonkowski/n8n-mcp/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
czlonkowski	n8n-mcp	Affected: < 2.51.3

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-45582

Vulnerability from fkie_nvd - Published: 2026-05-29 14:16 - Updated: 2026-07-21 12:10

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f	Patch
security-advisories@github.com	https://github.com/czlonkowski/n8n-mcp/pull/782	Issue Tracking, Patch
security-advisories@github.com	https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3	Product, Release Notes
security-advisories@github.com	https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w	Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	n8n-mcp	n8n-mcp	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n8n-mcp",
          "vendor": "czlonkowski",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.51.3"
            }
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    }
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    },
    {
      "lang": "es",
      "value": "n8n-MCP es un servidor MCP que proporciona a los asistentes de IA acceso a la documentaci\u00f3n, propiedades y operaciones de los nodos n8n. Antes de la versi\u00f3n 2.51.3, el saneador de telemetr\u00eda de flujos de trabajo pod\u00eda retener fragmentos parciales de par\u00e1metros de nodo con forma de URL antes de enviar los datos del flujo de trabajo al backend de telemetr\u00eda an\u00f3nima del proyecto. Los valores colocados en par\u00e1metros de nodo de estilo HTTP-Request \u2014 como identificadores de cliente o inquilino, secretos cortos incrustados en cadenas de consulta y par\u00e1metros de solicitud firmados \u2014 pod\u00edan, por lo tanto, aparecer en la telemetr\u00eda almacenada, en contra del l\u00edmite de recopilaci\u00f3n documentado en PRIVACY.md. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 2.51.3."
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  "lastModified": "2026-07-21T12:10:00.090",
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}

GHSA-F3RG-XQJJ-CJ9W

Vulnerability from github – Published: 2026-05-18 13:26 – Updated: 2026-06-09 10:27

Summary

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

Details

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.

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

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        "name": "n8n-mcp"
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        {
          "events": [
            {
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        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45582"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-201"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-18T13:26:51Z",
    "nvd_published_at": "2026-05-29T14:16:30Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nIn 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\u0027s anonymous telemetry backend. Values placed in HTTP-Request-style node parameters \u2014 such as customer or tenant identifiers, short secrets embedded in query strings, and signed request parameters \u2014 could therefore appear in stored telemetry, contrary to the collection boundary documented in `PRIVACY.md`.\n\n## Impact\n\nOperators with access to the project\u0027s 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 \u2014 credentials are removed by a separate code path, and long secrets and known-provider tokens are matched by dedicated patterns.\n\n## Patches\n\nFixed in **n8n-mcp `2.51.3`**. Upgrading is the recommended remediation.\n\n## Workarounds\n\nFor users who cannot upgrade immediately, disable anonymous telemetry by setting any of these environment variables to `true`:\n\n- `N8N_MCP_TELEMETRY_DISABLED`\n- `TELEMETRY_DISABLED`\n- `DISABLE_TELEMETRY`\n\n## Credit\n\nReported by @u-ktdi.",
  "id": "GHSA-f3rg-xqjj-cj9w",
  "modified": "2026-06-09T10:27:22Z",
  "published": "2026-05-18T13:26:51Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45582"
    },
    {
      "type": "WEB",
      "url": "https://github.com/czlonkowski/n8n-mcp/pull/782"
    },
    {
      "type": "WEB",
      "url": "https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/czlonkowski/n8n-mcp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-45582 (GCVE-0-2026-45582)

FKIE_CVE-2026-45582

GHSA-F3RG-XQJJ-CJ9W

Summary

Impact

Patches

Workarounds

Credit

Tags

Sightings

Nomenclature