{
  "cveId": "CVE-2026-87696",
  "url": "https://patchblox.com/security/cve/CVE-2026-87696",
  "summary": "CVE-2026-87696 is fixed in 4 products on 1 platform, first by KB5128898, released October 13, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Microsoft Exchange Server Elevation of Privilege Vulnerability",
  "description": "\u003Cp\u003EImproper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.\u003C/p\u003E",
  "published": "2026-10-13T07:00:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "cwe": "Improper Verification of Cryptographic Signature",
  "epss": 0.0042,
  "epssPercentile": 0.36543,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87696",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2016 Cumulative Update 23",
      "fixedVersion": "",
      "fix": "KB5128898",
      "url": "https://patchblox.com/security/fix/microsoft/kb5128898",
      "released": "2026-10-13T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2019 Cumulative Update 14",
      "fixedVersion": "",
      "fix": "KB5128897",
      "url": "https://patchblox.com/security/fix/microsoft/kb5128897",
      "released": "2026-10-13T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
      "fixedVersion": "",
      "fix": "KB5128896",
      "url": "https://patchblox.com/security/fix/microsoft/kb5128896",
      "released": "2026-10-13T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft Exchange Server Subscription Edition RTM",
      "fixedVersion": "",
      "fix": "KB5128895",
      "url": "https://patchblox.com/security/fix/microsoft/kb5128895",
      "released": "2026-10-13T07:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T18:46:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}