CVE-2026-45707

{
  "id": "CVE-2026-45707",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45707",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-01T19:05:28.776003Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "czlonkowski",
          "product": "n8n-mcp",
          "versions": [
            {
              "status": "affected",
              "version": "< 2.51.2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-05-29T14:16:31.240",
  "references": [
    {
      "url": "https://github.com/czlonkowski/n8n-mcp/commit/853015d0897be7cf2d9d4726de195c938e4395ab",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.2",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-jxx9-px88-pj69",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.2, when ENABLE_MULTI_TENANT=true, the HTTP transport documents that the target n8n instance is selected per-request from x-n8n-url / x-n8n-key headers. Requests that omitted those headers — or supplied only one of them — silently fell back to the process-level N8N_API_URL / N8N_API_KEY credentials configured for the operator's own n8n instance. As a result, an authenticated MCP tenant could cause n8n management calls to execute against the operator's instance instead of its own. This affects HTTP-mode deployments of n8n-mcp that are run as a shared multi-tenant service. Single-tenant deployments (ENABLE_MULTI_TENANT unset or false) are not affected. This vulnerability is fixed in 2.51.2."
    },
    {
      "lang": "es",
      "value": "n8n-MCP es un servidor MCP que proporciona a los asistentes de IA acceso a la documentación, propiedades y operaciones de los nodos n8n. Antes de 2.51.2, cuando ENABLE_MULTI_TENANT=true, el transporte HTTP documenta que la instancia n8n de destino se selecciona por solicitud a partir de los encabezados x-n8n-url / x-n8n-key. Las solicitudes que omitían esos encabezados — o que solo proporcionaban uno de ellos — recurrían silenciosamente a las credenciales N8N_API_URL / N8N_API_KEY a nivel de proceso configuradas para la propia instancia n8n del operador. Como resultado, un inquilino MCP autenticado podría hacer que las llamadas de gestión de n8n se ejecutaran contra la instancia del operador en lugar de la suya propia. Esto afecta a las implementaciones de n8n-mcp en modo HTTP que se ejecutan como un servicio multiinquilino compartido. Las implementaciones de inquilino único (ENABLE_MULTI_TENANT sin establecer o en falso) no se ven afectadas. Esta vulnerabilidad se ha corregido en 2.51.2."
    }
  ],
  "lastModified": "2026-07-21T12:10:00.090",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:n8n-mcp:n8n-mcp:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C2C49EE6-8E35-48F8-BE46-407510123226",
              "versionEndExcluding": "2.51.2"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "security-advisories@github.com"
}