{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "0ccbbf129444eb66344ccafb92b00df4"
        ]
      }
    ],
    "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-2026-40419 Microsoft Office Click-To-Run Elevation of Privilege Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40419"
      },
      {
        "category": "self",
        "summary": "CVE-2026-40419 Microsoft Office Click-To-Run Elevation of Privilege Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-40419.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 Office Click-To-Run Elevation of Privilege Vulnerability",
    "tracking": {
      "current_release_date": "2026-05-12T07:00:00.000Z",
      "generator": {
        "date": "2026-05-14T18:07:41.819Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-40419",
      "initial_release_date": "2026-05-12T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-12T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "<https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office 2019 for 32-bit editions <https://aka.ms/OfficeSecurityReleases",
              "product_id": "8"
            }
          },
          {
            "category": "product_version",
            "name": "https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office 2019 for 32-bit editions https://aka.ms/OfficeSecurityReleases",
              "product_id": "11573"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Office 2019 for 32-bit editions"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "<https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office 2019 for 64-bit editions <https://aka.ms/OfficeSecurityReleases",
              "product_id": "7"
            }
          },
          {
            "category": "product_version",
            "name": "https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office 2019 for 64-bit editions https://aka.ms/OfficeSecurityReleases",
              "product_id": "11574"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Office 2019 for 64-bit editions"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "<https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft 365 Apps for Enterprise for 32-bit Systems <https://aka.ms/OfficeSecurityReleases",
              "product_id": "6"
            }
          },
          {
            "category": "product_version",
            "name": "https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft 365 Apps for Enterprise for 32-bit Systems https://aka.ms/OfficeSecurityReleases",
              "product_id": "11762"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft 365 Apps for Enterprise for 32-bit Systems"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "<https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft 365 Apps for Enterprise for 64-bit Systems <https://aka.ms/OfficeSecurityReleases",
              "product_id": "5"
            }
          },
          {
            "category": "product_version",
            "name": "https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft 365 Apps for Enterprise for 64-bit Systems https://aka.ms/OfficeSecurityReleases",
              "product_id": "11763"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft 365 Apps for Enterprise for 64-bit Systems"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "<https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office LTSC 2021 for 64-bit editions <https://aka.ms/OfficeSecurityReleases",
              "product_id": "4"
            }
          },
          {
            "category": "product_version",
            "name": "https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office LTSC 2021 for 64-bit editions https://aka.ms/OfficeSecurityReleases",
              "product_id": "11952"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Office LTSC 2021 for 64-bit editions"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "<https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office LTSC 2021 for 32-bit editions <https://aka.ms/OfficeSecurityReleases",
              "product_id": "3"
            }
          },
          {
            "category": "product_version",
            "name": "https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office LTSC 2021 for 32-bit editions https://aka.ms/OfficeSecurityReleases",
              "product_id": "11953"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Office LTSC 2021 for 32-bit editions"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "<https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office LTSC 2024 for 32-bit editions <https://aka.ms/OfficeSecurityReleases",
              "product_id": "2"
            }
          },
          {
            "category": "product_version",
            "name": "https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office LTSC 2024 for 32-bit editions https://aka.ms/OfficeSecurityReleases",
              "product_id": "12420"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Office LTSC 2024 for 32-bit editions"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "<https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office LTSC 2024 for 64-bit editions <https://aka.ms/OfficeSecurityReleases",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "https://aka.ms/OfficeSecurityReleases",
            "product": {
              "name": "Microsoft Office LTSC 2024 for 64-bit editions https://aka.ms/OfficeSecurityReleases",
              "product_id": "12421"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Office LTSC 2024 for 64-bit editions"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-40419",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.",
          "title": "What privileges could be gained by an attacker who successfully exploited this vulnerability?"
        },
        {
          "category": "faq",
          "text": "No, the Preview Pane is not an attack vector.",
          "title": "Is the Preview Pane an attack vector for this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "11573",
          "11574",
          "11762",
          "11763",
          "11952",
          "11953",
          "12420",
          "12421"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6",
          "7",
          "8"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-40419 Microsoft Office Click-To-Run Elevation of Privilege Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40419"
        },
        {
          "category": "self",
          "summary": "CVE-2026-40419 Microsoft Office Click-To-Run Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-40419.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "https://aka.ms/OfficeSecurityReleases:Security Update:https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates",
          "product_ids": [
            "8",
            "7",
            "6",
            "5",
            "4",
            "3",
            "2",
            "1"
          ],
          "url": "https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 6.8,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/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",
            "5",
            "6",
            "7",
            "8"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Microsoft Office Click-To-Run Elevation of Privilege Vulnerability"
    }
  ]
}