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CVE-2026-21886

Estado: AnalizadaAlta (8.1)—

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.9.1, the GraphQL mutations "IndividualDeletionDeleteMutation" is intended to allow users to delete individual entity objects respectively. However, it was observed that this mutation can be misused to delete unrelated and sensitive objects such as analyses reports etc. This behavior stems from the lack of validation in the API to ensure that the targeted object is contextually related to the mutation being executed. Version 6.9.1 fixes the issue.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de autorización (CWE-285) en API GraphQL accesible remotamente con credenciales (PR:L), permitiendo eliminación no autorizada de objetos sensibles. Requiere acceso autenticado a servicio remoto.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningThreat Intelligence ProgramRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data StorageNetwork Segmentation

Tecnologías afectadas (1)

Citeum — Opencti

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-21886",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21886",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-17T16:09:27.056285Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "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:N/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "OpenCTI-Platform",
          "product": "opencti",
          "versions": [
            {
              "status": "affected",
              "version": "< 6.9.1"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-03-17T16:16:19.953",
  "references": [
    {
      "url": "https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-mhmx-j75v-2m6x",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-285"
        },
        {
          "lang": "en",
          "value": "CWE-566"
        },
        {
          "lang": "en",
          "value": "CWE-915"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to version 6.9.1, the GraphQL mutations \"IndividualDeletionDeleteMutation\" is intended to allow users to delete individual entity objects respectively. However, it was observed that this mutation can be misused to delete unrelated and sensitive objects such as analyses reports etc. This behavior stems from the lack of validation in the API to ensure that the targeted object is contextually related to the mutation being executed. Version 6.9.1 fixes the issue."
    },
    {
      "lang": "es",
      "value": "OpenCTI es una plataforma de código abierto para gestionar conocimiento de inteligencia de amenazas cibernéticas y observables. Antes de la versión 6.9.1, la mutación de GraphQL 'IndividualDeletionDeleteMutation' está destinada a permitir a los usuarios eliminar objetos de entidad individuales respectivamente. Sin embargo, se observó que esta mutación puede ser mal utilizada para eliminar objetos no relacionados y sensibles, como informes de análisis, etc. Este comportamiento se deriva de la falta de validación en la API para asegurar que el objeto objetivo esté contextualmente relacionado con la mutación que se está ejecutando. La versión 6.9.1 corrige el problema."
    }
  ],
  "lastModified": "2026-06-17T10:19:05.520",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "770FF6DC-74FC-4739-8A2E-A554D43CF7A9",
              "versionEndExcluding": "6.9.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}