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CVE-2026-42831

Estado: AnalizadaAlta (7.8)—

Heap-based buffer overflow in Microsoft Office 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.

Vector AV:L UI:R indica ejecución en cliente (abrir archivo preparado); heap overflow (CWE-122) en Office permite ejecución arbitraria de código con permisos del usuario.

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 (3)

Microsoft — 365 CopilotMicrosoft — OfficeMicrosoft — Office Long Term Servicing Channel

CWE

Referencias

JSON original (NVD)

Mostrar
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          "options": [
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          ],
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          "timestamp": "2026-05-13T03:56:52.720107Z"
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              "versionType": "custom"
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  "published": "2026-05-12T18:17:25.673",
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      "tags": [
        "Vendor Advisory"
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      "source": "secure@microsoft.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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      "value": "Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally."
    }
  ],
  "lastModified": "2026-06-17T10:48:28.377",
  "configurations": [
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  "sourceIdentifier": "secure@microsoft.com"
}