{
  "fix": "KB5126104",
  "url": "https://patchblox.com/security/fix/microsoft/kb5126104",
  "summary": "KB5126104, released September 8, 2026, fixes 5 CVEs across 4 products. None of them is reported as exploited. Patch Radar priority: High.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "September 2026 security update",
  "released": "2026-09-08T07:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2026-69522, high severity",
  "supported": true,
  "cveCount": 5,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00855,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5126104",
  "appliesTo": [
    {
      "product": ".NET 8.0 runtime installed on Linux",
      "productUrl": "https://patchblox.com/security/product/microsoft/net-8.0-runtime-installed-on-linux",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": ".NET 8.0 runtime installed on Mac OS",
      "productUrl": "https://patchblox.com/security/product/microsoft/net-8.0-runtime-installed-on-mac-os",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": ".NET 8.0 runtime installed on Windows",
      "productUrl": "https://patchblox.com/security/product/microsoft/net-8.0-runtime-installed-on-windows",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "ASP.NET Core 8.0",
      "productUrl": "https://patchblox.com/security/product/microsoft/asp.net-core-8.0",
      "fixedVersion": "",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2026-69522",
      "url": "https://patchblox.com/security/cve/CVE-2026-69522",
      "title": ".NET and Visual Studio Remote Code Execution Vulnerability",
      "component": "Visual Studio",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00837,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-69439",
      "url": "https://patchblox.com/security/cve/CVE-2026-69439",
      "title": ".NET and Visual Studio Elevation of Privilege Vulnerability",
      "component": ".NET and Visual Studio",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00819,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-71328",
      "url": "https://patchblox.com/security/cve/CVE-2026-71328",
      "title": ".NET and Visual Studio Remote Code Execution Vulnerability",
      "component": "Visual Studio",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00819,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-58649",
      "url": "https://patchblox.com/security/cve/CVE-2026-58649",
      "title": ".NET Information Disclosure Vulnerability",
      "component": ".NET",
      "impact": "Information Disclosure",
      "priority": "High",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.00359,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-69304",
      "url": "https://patchblox.com/security/cve/CVE-2026-69304",
      "title": "ASP.NET Core Denial of Service Vulnerability",
      "component": "ASP.NET Core",
      "impact": "Denial of Service",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.9,
      "epss": 0.00855,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T12:40:37Z"
}