{
  "document": {
    "category": "csaf_vex",
    "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"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-78439 Microsoft Office Graphics Component Remote Code Execution Vulnerability - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-78439.json"
      },
      {
        "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 Office Graphics Component Remote Code Execution Vulnerability",
    "tracking": {
      "current_release_date": "2026-09-17T07:00:00.000Z",
      "generator": {
        "date": "2026-10-01T22:52:24.965Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-78439",
      "initial_release_date": "2026-09-08T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-09-08T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-09-17T07:00:00.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Microsoft is announcing the availability of the security updates for Microsoft Office for Mac. Customers running affected Mac software should install the update for their product to be protected from this vulnerability. Customers running other Microsoft Office software do not need to take any action. See the [Release Notes](https://go.microsoft.com/fwlink/p/?linkid=831049) for more information and download links."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c16.113.26091433",
                "product": {
                  "name": "Microsoft Office LTSC for Mac 2021 \u003c16.113.26091433",
                  "product_id": "4"
                }
              },
              {
                "category": "product_version",
                "name": "16.113.26091433",
                "product": {
                  "name": "Microsoft Office LTSC for Mac 2021 16.113.26091433",
                  "product_id": "11951"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Office LTSC for Mac 2021"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c16.0.20430.20000",
                "product": {
                  "name": "Microsoft Office for Android \u003c16.0.20430.20000",
                  "product_id": "3"
                }
              },
              {
                "category": "product_version",
                "name": "16.0.20430.20000",
                "product": {
                  "name": "Microsoft Office for Android 16.0.20430.20000",
                  "product_id": "12155"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Office for Android"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c16.113.26091433",
                "product": {
                  "name": "Microsoft Office LTSC for Mac 2024 \u003c16.113.26091433",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "16.113.26091433",
                "product": {
                  "name": "Microsoft Office LTSC for Mac 2024 16.113.26091433",
                  "product_id": "12440"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Office LTSC for Mac 2024"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c16.113.26091433",
                "product": {
                  "name": "Microsoft Office 365 for Mac \u003c16.113.26091433",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "16.113.26091433",
                "product": {
                  "name": "Microsoft Office 365 for Mac 16.113.26091433",
                  "product_id": "21368"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Office 365 for Mac"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-78439",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "fixed": [
          "11951",
          "12155",
          "12440",
          "21368"
        ],
        "known_affected": [
          "4",
          "3",
          "2",
          "1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-78439 Microsoft Office Graphics Component Remote Code Execution Vulnerability - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-78439.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-08T07:00:00.000Z",
          "details": "16.113.26091433:Security Update:https://go.microsoft.com/fwlink/p/?linkid=831049",
          "product_ids": [
            "4",
            "2"
          ],
          "url": "https://go.microsoft.com/fwlink/p/?linkid=831049"
        },
        {
          "category": "vendor_fix",
          "date": "2026-09-08T07:00:00.000Z",
          "details": "16.0.20430.20000:Security Update:https://support.google.com/googleplay/answer/113412?hl=en",
          "product_ids": [
            "3"
          ],
          "url": "https://support.google.com/googleplay/answer/113412?hl=en"
        },
        {
          "category": "vendor_fix",
          "date": "2026-09-08T07:00:00.000Z",
          "details": "16.113.26091433:Security Update:https://www.microsoft.com/en-us/microsoft-365/mac/microsoft-365-for-mac?msockid=35f9adb0e74b61392038b90de6fe608c",
          "product_ids": [
            "1"
          ],
          "url": "https://www.microsoft.com/en-us/microsoft-365/mac/microsoft-365-for-mac?msockid=35f9adb0e74b61392038b90de6fe608c"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 7.7,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4"
          ]
        }
      ],
      "title": "Microsoft Office Graphics Component Remote Code Execution Vulnerability"
    }
  ]
}