Vulnerability-Lookup

GHSA-F3RG-XQJJ-CJ9W

Vulnerability from github – Published: 2026-05-18 13:26 – Updated: 2026-05-18 13:26

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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "n8n-mcp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.51.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45582"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-201"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-18T13:26:51Z",
    "nvd_published_at": null,
    "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": "2026-05-18T13:26:51Z",
  "published": "2026-05-18T13:26:51Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w"
    },
    {
      "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"
}

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

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

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45582",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-29T18:44:38.040272Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-29T18:44:55.077Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n8n-mcp",
          "vendor": "czlonkowski",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.51.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\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. This vulnerability is fixed in 2.51.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-201",
              "description": "CWE-201: Insertion of Sensitive Information Into Sent Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-29T13:37:30.720Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w"
        },
        {
          "name": "https://github.com/czlonkowski/n8n-mcp/pull/782",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/czlonkowski/n8n-mcp/pull/782"
        },
        {
          "name": "https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f"
        },
        {
          "name": "https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3"
        }
      ],
      "source": {
        "advisory": "GHSA-f3rg-xqjj-cj9w",
        "discovery": "UNKNOWN"
      },
      "title": "n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45582",
    "datePublished": "2026-05-29T13:37:30.720Z",
    "dateReserved": "2026-05-12T19:00:14.601Z",
    "dateUpdated": "2026-05-29T18:44:55.077Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-F3RG-XQJJ-CJ9W

Summary

Impact

Patches

Workarounds

Credit

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

Tags

Sightings

Nomenclature