{
  "cveId": "CVE-2026-40407",
  "url": "https://patchblox.com/security/cve/CVE-2026-40407",
  "summary": "CVE-2026-40407 is fixed in 31 products on 1 platform, first by KB5087537, released May 12, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Windows Common Log File System Driver Elevation of Privilege Vulnerability",
  "description": "\u003Cp\u003EHeap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.\u003C/p\u003E",
  "published": "2026-05-12T07:00:00Z",
  "severity": "Important",
  "cvss": 7.8,
  "cwe": "Heap-based Buffer Overflow",
  "epss": 0.00304,
  "epssPercentile": 0.23353,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Unlikely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40407",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for 32-bit Systems",
      "fixedVersion": "14393.9140",
      "fix": "KB5087537",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087537",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for x64-based Systems",
      "fixedVersion": "14393.9140",
      "fix": "KB5087537",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087537",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for 32-bit Systems",
      "fixedVersion": "17763.8755",
      "fix": "KB5087538",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087538",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for x64-based Systems",
      "fixedVersion": "17763.8755",
      "fix": "KB5087538",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087538",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 21H2 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5087544",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087544",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 21H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5087544",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087544",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 21H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5087544",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087544",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 22H2 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5094127",
      "url": "https://patchblox.com/security/fix/microsoft/kb5094127",
      "released": "2026-06-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 22H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5094127",
      "url": "https://patchblox.com/security/fix/microsoft/kb5094127",
      "released": "2026-06-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 22H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5094127",
      "url": "https://patchblox.com/security/fix/microsoft/kb5094127",
      "released": "2026-06-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 23H2 for ARM64-based Systems",
      "fixedVersion": "22631.7079",
      "fix": "KB5087420",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087420",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 23H2 for x64-based Systems",
      "fixedVersion": "22631.7219",
      "fix": "KB5093998",
      "url": "https://patchblox.com/security/fix/microsoft/kb5093998",
      "released": "2026-06-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5089549",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089549",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5089466",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089466",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5089549",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089549",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5089466",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089466",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 25H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5089549",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089549",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 25H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5089466",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089466",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 25H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5089549",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089549",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 25H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5089466",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089466",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 26H1 for ARM64-based Systems",
      "fixedVersion": "28000.2113",
      "fix": "KB5089548",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089548",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 version 26H1 for x64-based Systems",
      "fixedVersion": "28000.2113",
      "fix": "KB5089548",
      "url": "https://patchblox.com/security/fix/microsoft/kb5089548",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012",
      "fixedVersion": "",
      "fix": "KB5087470",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087470",
      "released": "2026-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5087470",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087470",
      "released": "2026-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB5087471",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087471",
      "released": "2026-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5087471",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087471",
      "released": "2026-05-12T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016",
      "fixedVersion": "14393.9140",
      "fix": "KB5087537",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087537",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016 (Server Core installation)",
      "fixedVersion": "14393.9140",
      "fix": "KB5087537",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087537",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2019",
      "fixedVersion": "17763.8755",
      "fix": "KB5087538",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087538",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2019 (Server Core installation)",
      "fixedVersion": "17763.8755",
      "fix": "KB5087538",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087538",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2022",
      "fixedVersion": "20348.5074",
      "fix": "KB5087424",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087424",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2022",
      "fixedVersion": "20348.5139",
      "fix": "KB5087545",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087545",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2022 (Server Core installation)",
      "fixedVersion": "20348.5074",
      "fix": "KB5087424",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087424",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2022 (Server Core installation)",
      "fixedVersion": "20348.5139",
      "fix": "KB5087545",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087545",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
      "fixedVersion": "25398.2330",
      "fix": "KB5087541",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087541",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025",
      "fixedVersion": "26100.32860",
      "fix": "KB5087539",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087539",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025",
      "fixedVersion": "26100.32772",
      "fix": "KB5087423",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087423",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025 (Server Core installation)",
      "fixedVersion": "26100.32860",
      "fix": "KB5087539",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087539",
      "released": "2026-05-12T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025 (Server Core installation)",
      "fixedVersion": "26100.32772",
      "fix": "KB5087423",
      "url": "https://patchblox.com/security/fix/microsoft/kb5087423",
      "released": "2026-05-12T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T12:40:37Z"
}