{
  "fix": "KB5123300",
  "url": "https://patchblox.com/security/fix/microsoft/kb5123300",
  "summary": "KB5123300, released September 8, 2026, fixes 10 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "September 2026 security update",
  "released": "2026-09-08T07:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-66302, rated Critical",
  "supported": true,
  "cveCount": 10,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.01174,
  "maxCvss": 9.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5123300",
  "appliesTo": [
    {
      "product": "Skype for Business Server 2019 CU8",
      "productUrl": "https://patchblox.com/security/product/microsoft/skype-for-business-server-2019-cu8",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Skype for Business Server Subscription Edition CU1",
      "productUrl": "https://patchblox.com/security/product/microsoft/skype-for-business-server-subscription-edition-cu1",
      "fixedVersion": "",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2026-66302",
      "url": "https://patchblox.com/security/cve/CVE-2026-66302",
      "title": "Skype for Business Remote Code Execution Vulnerability",
      "component": "Skype for Business",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 9.8,
      "epss": 0.00974,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-66307",
      "url": "https://patchblox.com/security/cve/CVE-2026-66307",
      "title": "Skype for Business and Lync Denial of Service Vulnerability",
      "component": "Skype for Business",
      "impact": "Denial of Service",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.01174,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-66304",
      "url": "https://patchblox.com/security/cve/CVE-2026-66304",
      "title": "Skype for Business Information Disclosure Vulnerability",
      "component": "Skype for Business",
      "impact": "Information Disclosure",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00973,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-66305",
      "url": "https://patchblox.com/security/cve/CVE-2026-66305",
      "title": "Skype for Business Spoofing Vulnerability",
      "component": "Skype for Business",
      "impact": "Spoofing",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.1,
      "epss": 0.00526,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-69646",
      "url": "https://patchblox.com/security/cve/CVE-2026-69646",
      "title": "Skype for Business Spoofing Vulnerability",
      "component": "Skype for Business",
      "impact": "Spoofing",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.3,
      "epss": 0.0032,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-66303",
      "url": "https://patchblox.com/security/cve/CVE-2026-66303",
      "title": "Skype for Business and Lync Denial of Service Vulnerability",
      "component": "Skype for Business",
      "impact": "Denial of Service",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01138,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-66308",
      "url": "https://patchblox.com/security/cve/CVE-2026-66308",
      "title": "Skype for Business and Lync Denial of Service Vulnerability",
      "component": "Skype for Business",
      "impact": "Denial of Service",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01138,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-66306",
      "url": "https://patchblox.com/security/cve/CVE-2026-66306",
      "title": "Skype for Business Information Disclosure Vulnerability",
      "component": "Skype for Business",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.00922,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-63523",
      "url": "https://patchblox.com/security/cve/CVE-2026-63523",
      "title": "Skype for Business Spoofing Vulnerability",
      "component": "Skype for Business",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.00553,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-69642",
      "url": "https://patchblox.com/security/cve/CVE-2026-69642",
      "title": "Skype for Business Spoofing Vulnerability",
      "component": "Skype for Business",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.00413,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}