{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Jan Mitchell from Microsoft"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-96940 Microsoft Exchange Server Elevation of Privilege Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940"
      },
      {
        "category": "self",
        "summary": "CVE-2026-96940 Microsoft Exchange Server Elevation of Privilege Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-96940.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Microsoft Exchange Server Elevation of Privilege Vulnerability",
    "tracking": {
      "current_release_date": "2026-10-02T07:00:00.000Z",
      "generator": {
        "date": "2026-11-03T01:25:21.595Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-96940",
      "initial_release_date": "2026-10-02T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-10-02T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<15.02.1544.048",
                "product": {
                  "name": "Microsoft Exchange Server 2019 Cumulative Update 14 <15.02.1544.048",
                  "product_id": "3"
                }
              },
              {
                "category": "product_version",
                "name": "15.02.1544.048",
                "product": {
                  "name": "Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.048",
                  "product_id": "12293"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Exchange Server 2019 Cumulative Update 14"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<15.01.2507.075",
                "product": {
                  "name": "Microsoft Exchange Server 2016 Cumulative Update 23 <15.01.2507.075",
                  "product_id": "4"
                }
              },
              {
                "category": "product_version",
                "name": "15.01.2507.075",
                "product": {
                  "name": "Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.075",
                  "product_id": "12039"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Exchange Server 2016 Cumulative Update 23"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<15.02.2562.053",
                "product": {
                  "name": "Microsoft Exchange Server Subscription Edition RTM <15.02.2562.053",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "15.02.2562.053",
                "product": {
                  "name": "Microsoft Exchange Server Subscription Edition RTM 15.02.2562.053",
                  "product_id": "16792"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Exchange Server Subscription Edition RTM"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<15.02.1748.053",
                "product": {
                  "name": "Microsoft Exchange Server 2019 Cumulative Update 15 <15.02.1748.053",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "15.02.1748.053",
                "product": {
                  "name": "Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.053",
                  "product_id": "12502"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Exchange Server 2019 Cumulative Update 15"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-96940",
      "cwe": {
        "id": "CWE-1390",
        "name": "Weak Authentication"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "Microsoft has already deployed a related service-side fix to Exchange Online. Exchange Online customers do not need to take any action to receive the fix. Customers using affected on-premises Microsoft Exchange Server products should install the applicable security updates listed in the Security Updates table.\nPlease see the Exchange blog for more information.",
          "title": "Is Exchange Online affected, and do Exchange Online customers need to take action?"
        },
        {
          "category": "faq",
          "text": "An authenticated attacker who successfully exploited this vulnerability could gain unauthorized access to other users' mailboxes within the same organization and read email messages and attachments. The vulnerability does not allow access across tenant boundaries.",
          "title": "What privileges could be gained by an attacker who successfully exploited this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "12039",
          "12293",
          "12502",
          "16792"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-96940 Microsoft Exchange Server Elevation of Privilege Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940"
        },
        {
          "category": "self",
          "summary": "CVE-2026-96940 Microsoft Exchange Server Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-96940.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-02T07:00:00.000Z",
          "details": "15.02.1544.048:Security Update:https://support.microsoft.com/help/5129957",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/help/5129957"
        },
        {
          "category": "vendor_fix",
          "date": "2026-10-02T07:00:00.000Z",
          "details": "15.01.2507.075:Security Update:https://support.microsoft.com/help/5129958",
          "product_ids": [
            "4"
          ],
          "url": "https://support.microsoft.com/help/5129958"
        },
        {
          "category": "vendor_fix",
          "date": "2026-10-02T07:00:00.000Z",
          "details": "15.02.2562.053:Security Update:https://support.microsoft.com/help/5129955",
          "product_ids": [
            "1"
          ],
          "url": "https://support.microsoft.com/help/5129955"
        },
        {
          "category": "vendor_fix",
          "date": "2026-10-02T07:00:00.000Z",
          "details": "15.02.1748.053:Security Update:https://support.microsoft.com/help/5129956",
          "product_ids": [
            "2"
          ],
          "url": "https://support.microsoft.com/help/5129956"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 7.7,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely"
        }
      ],
      "title": "Microsoft Exchange Server Elevation of Privilege Vulnerability"
    }
  ]
}