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CVE-2026-21219

Estado: AnalizadaAlta (7)—

Use after free in Inbox COM Objects allows an unauthorized attacker to execute code locally.

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.

CWE-416 (use-after-free) en COM Objects de Windows SDK con UI:R permite ejecución de código en cliente tras abrir fichero preparado. Impacto: ejecución de comandos.

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

Restrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or Program

Tecnologías afectadas (1)

Microsoft — Windows Software Development KIT

CWE

Referencias

JSON original (NVD)

Mostrar
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
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            },
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          "version": "2.0.3",
          "timestamp": "2026-01-14T04:56:07.290291Z"
        }
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          "userInteraction": "REQUIRED",
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          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Windows SDK",
          "versions": [
            {
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              "version": "26100",
              "lessThan": "10.0.26100.7463",
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            }
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      ]
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  ],
  "published": "2026-01-13T18:16:24.580",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21219",
      "tags": [
        "Vendor Advisory"
      ],
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    },
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      "value": "Uso después de liberación en objetos COM de Inbox permite a un atacante no autorizado ejecutar código localmente."
    }
  ],
  "lastModified": "2026-06-17T10:18:18.027",
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