CVE-2026-5423

{
  "id": "CVE-2026-5423",
  "sourceIdentifier": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6",
  "published": "2026-08-06T16:16:44.430",
  "lastModified": "2026-10-24T16:10:00.153",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "@neo4j/graphql library versions prior to 7.5.6 fail to verify the authenticity of a client-supplied, pre-decoded JWT object passed through GraphQL subscription connectionParams. As a result, any unauthenticated remote client that can open a GraphQL-over-WebSocket connection can forge arbitrary JWT claims (e.g. sub, roles) in connectionParams.jwt and have them accepted as authenticated identity for the purposes of @authentication and @subscriptionsAuthorization directive evaluation. This allows a fully unauthenticated attacker to receive subscription events that should be restricted to specific authenticated roles/users.\nUpgrade the library to versions 7.5.6+ or 5.12.14+. v6 is end-of-life and will not receive a fix."
    },
    {
      "lang": "es",
      "value": "Las versiones de la biblioteca @neo4j/graphql anteriores a la 7.5.6 no verifican la autenticidad de un objeto JWT pre-decodificado suministrado por el cliente y pasado a través de los “connectionParams” de la suscripción GraphQL. Como resultado, cualquier cliente remoto no autenticado que pueda abrir una conexión GraphQL-over-WebSocket puede falsificar reclamaciones JWT arbitrarias (p. ej., ’sub’, ’roles’) en “connectionParams.jwt” y hacer que se acepten como identidad autenticada para los propósitos de la evaluación de las directivas “@authentication” y “@subscriptionsAuthorization”. Esto permite a un atacante completamente no autenticado recibir eventos de suscripción que deberían estar restringidos a roles/usuarios autenticados específicos.\nActualice la biblioteca a las versiones 7.5.6+ o 5.12.14+. La v6 ha llegado al fin de su vida útil y no recibirá una corrección."
    }
  ],
  "affected": [
    {
      "source": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6",
      "affectedData": [
        {
          "vendor": "neo4j",
          "product": "graphql",
          "defaultStatus": "unaffected",
          "collectionURL": "https://registry.npmjs.org",
          "packageName": "@neo4j/graphql",
          "repo": "https://github.com/neo4j/graphql",
          "versions": [
            {
              "version": "7.0.0",
              "lessThan": "7.5.6",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.0.0",
              "lessThan": "5.12.14",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.0.0",
              "lessThanOrEqual": "6.6.4",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV40": [
      {
        "source": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6",
        "type": "Secondary",
        "cvssData": {
          "version": "4.0",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "subAvailabilityImpact": "NONE",
          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
        }
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-06T15:45:16.532890Z",
          "id": "CVE-2026-5423",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-302"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/neo4j/graphql/security/advisories/GHSA-fcpg-3fw5-vc65",
      "source": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6"
    },
    {
      "url": "https://neo4j.com/security/CVE-2026-5423",
      "source": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6"
    }
  ]
}