CVE-2026-26143

Estado: AnalizadaAlta (7.8)—

Improper input validation in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature locally.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.47%
Percentil entre todas las CVEs puntuadas: 38
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1203 Exploitation for Client Executionexecution95 %
Impacto principalT1059.001 PowerShellexecution85 %
Impacto secundarioT1068 Exploitation for Privilege Escalationprivilege escalation75 %

AV:L + UI:R apunta a T1203 (ejecución en cliente con interacción). CWE-20 + PowerShell sugiere bypass de validación permitiendo T1059.001 (ejecución de comandos PS) y potencial escalada (T1068) al bypasear defensas.

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

Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software Threat Intelligence Program Privileged Account Management

Tecnologías afectadas (1)

Microsoft — Powershell

CWE

CWE-20

Referencias

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26143

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-26143",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-26143",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-16T13:24:29.195623Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "secure@microsoft.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "PowerShell 7.4",
          "versions": [
            {
              "status": "affected",
              "version": "7.4.0",
              "lessThan": "7.4.14",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "PowerShell 7.5",
          "versions": [
            {
              "status": "affected",
              "version": "7.5.0",
              "lessThan": "7.5.5",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-04-14T18:16:45.620",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26143",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secure@microsoft.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper input validation in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature locally."
    }
  ],
  "lastModified": "2026-06-17T10:25:48.180",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:microsoft:powershell:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "829CDFB8-FB01-4E66-85D8-33F093A907B9",
              "versionEndExcluding": "7.4.14",
              "versionStartIncluding": "7.4"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:powershell:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EF18DEDE-5231-4109-BEE2-E0DBF184ABEC",
              "versionEndExcluding": "7.5.5",
              "versionStartIncluding": "7.5"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secure@microsoft.com"
}