{
  "cveId": "CVE-2020-0903",
  "url": "https://patchblox.com/security/cve/CVE-2020-0903",
  "summary": "CVE-2020-0903 is fixed in 4 products on 1 platform, first by KB4540123, released March 10, 2020. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Microsoft Exchange Server Spoofing Vulnerability",
  "description": "\u003Cp\u003EA cross-site-scripting (XSS) vulnerability exists when Microsoft Exchange Server does not properly sanitize a specially crafted web request to an affected Exchange server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected server.\u003C/p\u003E\n\u003Cp\u003EThe attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current user. The attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim\u0027s identity to take actions on the Exchange server on behalf of the user, such as change permissions and delete content, and inject malicious content in the browser of the user.\u003C/p\u003E\n\u003Cp\u003EThe security update addresses the vulnerability by helping to ensure that Exchange Server properly sanitizes web requests.\u003C/p\u003E",
  "published": "2020-03-10T07:00:00Z",
  "severity": "Important",
  "epss": 0.01649,
  "epssPercentile": 0.76639,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-0903",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2016 Cumulative Update 14",
      "fixedVersion": "",
      "fix": "KB4540123",
      "url": "https://patchblox.com/security/fix/microsoft/kb4540123",
      "released": "2020-03-10T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2016 Cumulative Update 15",
      "fixedVersion": "",
      "fix": "KB4540123",
      "url": "https://patchblox.com/security/fix/microsoft/kb4540123",
      "released": "2020-03-10T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2019 Cumulative Update 3",
      "fixedVersion": "",
      "fix": "KB4540123",
      "url": "https://patchblox.com/security/fix/microsoft/kb4540123",
      "released": "2020-03-10T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2019 Cumulative Update 4",
      "fixedVersion": "",
      "fix": "KB4540123",
      "url": "https://patchblox.com/security/fix/microsoft/kb4540123",
      "released": "2020-03-10T07:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}