{
  "cveId": "CVE-2025-53786",
  "url": "https://patchblox.com/security/cve/CVE-2025-53786",
  "summary": "CVE-2025-53786 is fixed in 4 products on 1 platform, first by KB5050674, released August 12, 2025. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.",
  "title": "Microsoft Exchange Server Hybrid Deployment Elevation of Privilege Vulnerability",
  "description": "\u003Cp\u003EOn April 18th 2025, Microsoft announced \u003Ca href=\u0022https://techcommunity.microsoft.com/blog/exchange/exchange-server-security-changes-for-hybrid-deployments/4396833\u0022\u003EExchange Server Security Changes for Hybrid Deployments\u003C/a\u003E and accompanying non-security \u003Ca href=\u0022https://techcommunity.microsoft.com/blog/exchange/released-april-2025-exchange-server-hotfix-updates/4402471\u0022\u003EHot Fix\u003C/a\u003E. Microsoft made these changes in the general interest of improving the security of hybrid Exchange deployments. Following further investigation, Microsoft identified specific security implications tied to the guidance and configuration steps outlined in the April announcement. Microsoft is issuing CVE-2025-53786 to document a vulnerability that is addressed by taking the steps documented with the April 18th announcement. Microsoft strongly recommends reading the information, installing the April 2025 (or later) Hot Fix and implementing the changes in your Exchange Server and hybrid environment.\u003C/p\u003E",
  "published": "2025-08-12T12:00:00Z",
  "severity": "Important",
  "cvss": 8,
  "cwe": "Improper Authentication",
  "epss": 0.08031,
  "epssPercentile": 0.94812,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation More Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53786",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
      "fixedVersion": "",
      "fix": "KB5050674",
      "url": "https://patchblox.com/security/fix/microsoft/kb5050674",
      "released": "2025-08-12T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2019 Cumulative Update 14",
      "fixedVersion": "",
      "fix": "KB5050673",
      "url": "https://patchblox.com/security/fix/microsoft/kb5050673",
      "released": "2025-08-12T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
      "fixedVersion": "",
      "fix": "KB5050672",
      "url": "https://patchblox.com/security/fix/microsoft/kb5050672",
      "released": "2025-08-12T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server Subscription Edition RTM",
      "fixedVersion": "",
      "fix": "KB5047155",
      "url": "https://patchblox.com/security/fix/microsoft/kb5047155",
      "released": "2025-08-12T12:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}