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CVE-2026-81963

Estado: AnalizadaAlta (7.8)⚠ Explotación activa

Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges 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).

CISA KEV — explotada activamente

Tecnologías afectadas (5)

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-81963",
  "cveTags": [],
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-07T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV31": [
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        "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:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Windows 11 version 23H2",
          "versions": [
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          "platforms": [
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            "x64-based Systems"
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        {
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          "product": "Windows 11 version 26H1",
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              "status": "affected",
              "version": "10.0.28000.0",
              "lessThan": "10.0.28000.2954",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server 2025",
          "versions": [
            {
              "status": "affected",
              "version": "10.0.26100.0",
              "lessThan": "10.0.26100.33438",
              "versionType": "custom"
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          ],
          "platforms": [
            "x64-based Systems"
          ]
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        {
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          "product": "Windows Server 2025 (Server Core installation)",
          "versions": [
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              "versionType": "custom"
            }
          ],
          "platforms": [
            "x64-based Systems"
          ]
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      ]
    }
  ],
  "published": "2026-09-08T18:21:00.090",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81963",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81963",
      "tags": [
        "US Government Resource"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secure@microsoft.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        },
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally."
    }
  ],
  "lastModified": "2026-09-09T05:18:17.173",
  "cisaActionDue": "2026-09-22",
  "cisaExploitAdd": "2026-09-08",
  "configurations": [
    {
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        {
          "negate": false,
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          "operator": "OR"
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  ],
  "sourceIdentifier": "secure@microsoft.com",
  "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "cisaVulnerabilityName": "Microsoft Windows Link Following Vulnerability"
}