{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "P1hcn"
        ]
      }
    ],
    "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-2026-70279 Microsoft Exchange Server Spoofing Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70279"
      },
      {
        "category": "self",
        "summary": "CVE-2026-70279 Microsoft Exchange Server Spoofing Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-70279.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 Spoofing Vulnerability",
    "tracking": {
      "current_release_date": "2026-10-13T07:00:00.000Z",
      "generator": {
        "date": "2026-10-31T18:00:10.232Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-70279",
      "initial_release_date": "2026-10-13T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-10-13T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<15.02.1748.055",
                "product": {
                  "name": "Microsoft Exchange Server 2019 Cumulative Update 15 <15.02.1748.055",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "15.02.1748.055",
                "product": {
                  "name": "Microsoft Exchange Server 2019 Cumulative Update 15 15.02.1748.055",
                  "product_id": "12502"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Exchange Server 2019 Cumulative Update 15"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<15.02.1544.050",
                "product": {
                  "name": "Microsoft Exchange Server 2019 Cumulative Update 14 <15.02.1544.050",
                  "product_id": "3"
                }
              },
              {
                "category": "product_version",
                "name": "15.02.1544.050",
                "product": {
                  "name": "Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1544.050",
                  "product_id": "12293"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Exchange Server 2019 Cumulative Update 14"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<15.01.2507.077",
                "product": {
                  "name": "Microsoft Exchange Server 2016 Cumulative Update 23 <15.01.2507.077",
                  "product_id": "4"
                }
              },
              {
                "category": "product_version",
                "name": "15.01.2507.077",
                "product": {
                  "name": "Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.077",
                  "product_id": "12039"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Exchange Server 2016 Cumulative Update 23"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<15.02.2562.056",
                "product": {
                  "name": "Microsoft Exchange Server Subscription Edition RTM <15.02.2562.056",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "15.02.2562.056",
                "product": {
                  "name": "Microsoft Exchange Server Subscription Edition RTM 15.02.2562.056",
                  "product_id": "16792"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Exchange Server Subscription Edition RTM"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-70279",
      "cwe": {
        "id": "CWE-79",
        "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An attacker could send a specially crafted link to a user and persuade them to click it, with no authentication required. If a user with administrative privileges clicks the link, successful exploitation could allow the attacker to perform actions using that user's privileges, potentially allowing access to or modification of organizational data.",
          "title": "How could an attacker exploit this vulnerability?"
        },
        {
          "category": "faq",
          "text": "Exploitation of the vulnerability requires that a user to open a specially crafted link.\nAn attacker would have no way to force users to click the link. Instead, an attacker would have to convince users to click the link through social engineering.",
          "title": "According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?"
        },
        {
          "category": "faq",
          "text": "The vulnerability is in the web server, but the malicious scripts execute in the victim’s browser on their machine.",
          "title": "According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "12039",
          "12293",
          "12502",
          "16792"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-70279 Microsoft Exchange Server Spoofing Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70279"
        },
        {
          "category": "self",
          "summary": "CVE-2026-70279 Microsoft Exchange Server Spoofing Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-70279.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-13T07:00:00.000Z",
          "details": "15.02.1748.055:Security Update:https://support.microsoft.com/help/5128896",
          "product_ids": [
            "2"
          ],
          "url": "https://support.microsoft.com/help/5128896"
        },
        {
          "category": "vendor_fix",
          "date": "2026-10-13T07:00:00.000Z",
          "details": "15.02.1544.050:Security Update:https://support.microsoft.com/help/5128897",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/help/5128897"
        },
        {
          "category": "vendor_fix",
          "date": "2026-10-13T07:00:00.000Z",
          "details": "15.01.2507.077:Security Update:https://support.microsoft.com/help/5128898",
          "product_ids": [
            "4"
          ],
          "url": "https://support.microsoft.com/help/5128898"
        },
        {
          "category": "vendor_fix",
          "date": "2026-10-13T07:00:00.000Z",
          "details": "15.02.2562.056:Security Update:https://support.microsoft.com/help/5128895",
          "product_ids": [
            "1"
          ],
          "url": "https://support.microsoft.com/help/5128895"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "CHANGED",
            "temporalScore": 8.1,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Spoofing"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely"
        }
      ],
      "title": "Microsoft Exchange Server Spoofing Vulnerability"
    }
  ]
}