{
  "fix": "KB5001916",
  "url": "https://patchblox.com/security/fix/microsoft/kb5001916",
  "summary": "KB5001916, released May 11, 2021, fixes 7 CVEs in Microsoft SharePoint Server 2019. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "May 2021 security update",
  "released": "2021-05-11T12:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2021-28474, exploitation more likely",
  "supported": false,
  "cveCount": 7,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.50768,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5001916",
  "appliesTo": [
    {
      "product": "Microsoft SharePoint Server 2019",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-sharepoint-server-2019",
      "fixedVersion": "",
      "supported": false
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-28474",
      "url": "https://patchblox.com/security/cve/CVE-2021-28474",
      "title": "Microsoft SharePoint Server Remote Code Execution Vulnerability",
      "component": "Microsoft Office SharePoint",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.50768,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31181",
      "url": "https://patchblox.com/security/cve/CVE-2021-31181",
      "title": "Microsoft SharePoint Remote Code Execution Vulnerability",
      "component": "Microsoft Office SharePoint",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.29011,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31172",
      "url": "https://patchblox.com/security/cve/CVE-2021-31172",
      "title": "Microsoft SharePoint Server Spoofing Vulnerability",
      "component": "Microsoft Office SharePoint",
      "impact": "Spoofing",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.1,
      "epss": 0.01812,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-28478",
      "url": "https://patchblox.com/security/cve/CVE-2021-28478",
      "title": "Microsoft SharePoint Server Spoofing Vulnerability",
      "component": "Microsoft Office SharePoint",
      "impact": "Spoofing",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.6,
      "epss": 0.01569,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31173",
      "url": "https://patchblox.com/security/cve/CVE-2021-31173",
      "title": "Microsoft SharePoint Server Information Disclosure Vulnerability",
      "component": "Microsoft Office SharePoint",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.3,
      "epss": 0.02079,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-26418",
      "url": "https://patchblox.com/security/cve/CVE-2021-26418",
      "title": "Microsoft SharePoint Server Spoofing Vulnerability",
      "component": "Microsoft Office SharePoint",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 4.6,
      "epss": 0.0124,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31171",
      "url": "https://patchblox.com/security/cve/CVE-2021-31171",
      "title": "Microsoft SharePoint Information Disclosure Vulnerability",
      "component": "Microsoft Office SharePoint",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 4.1,
      "epss": 0.00647,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}