{"api_version":"1","generated_at":"2026-06-02T18:12:34+00:00","cve":"CVE-2026-40363","urls":{"html":"https://cve.report/CVE-2026-40363","api":"https://cve.report/api/cve/CVE-2026-40363.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-40363","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-40363"},"summary":{"title":"Microsoft Office Remote Code Execution Vulnerability","description":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.","state":"PUBLISHED","assigner":"microsoft","published_at":"2026-05-12 18:17:15","updated_at":"2026-05-19 18:05:10"},"problem_types":["CWE-122","CWE-122 CWE-122: Heap-based Buffer Overflow"],"metrics":[{"version":"3.1","source":"secure@microsoft.com","type":"Primary","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","data":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","version":"3.1"}}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40363","name":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40363","refsource":"secure@microsoft.com","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-40363","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40363","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Microsoft","product":"Microsoft 365 Apps for Enterprise","version":"affected 16.0.1 https://aka.ms/OfficeSecurityReleases custom","platforms":["32-bit Systems","x64-based Systems"]},{"source":"CNA","vendor":"Microsoft","product":"Microsoft Office 2016","version":"affected 16.0.0 16.0.5552.1000 custom","platforms":["32-bit Systems","x64-based Systems"]},{"source":"CNA","vendor":"Microsoft","product":"Microsoft Office 2019","version":"affected 19.0.0 https://aka.ms/OfficeSecurityReleases custom","platforms":["32-bit Systems","x64-based Systems"]},{"source":"CNA","vendor":"Microsoft","product":"Microsoft Office for Android","version":"affected 16.0.1 16.0.19822.20190 custom","platforms":[]},{"source":"CNA","vendor":"Microsoft","product":"Microsoft Office LTSC 2021","version":"affected 16.0.1 https://aka.ms/OfficeSecurityReleases custom","platforms":["32-bit Systems","x64-based Systems"]},{"source":"CNA","vendor":"Microsoft","product":"Microsoft Office LTSC 2024","version":"affected 16.0.0 https://aka.ms/OfficeSecurityReleases custom","platforms":["32-bit Systems","x64-based Systems"]},{"source":"CNA","vendor":"Microsoft","product":"Microsoft Office LTSC for Mac 2021","version":"affected 16.0.1 16.109.26051019 custom","platforms":[]},{"source":"CNA","vendor":"Microsoft","product":"Microsoft Office LTSC for Mac 2024","version":"affected 16.0.0 16.109.26051019 custom","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"365_apps","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"enterprise","cpe11":"*","cpe12":"x64","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"365_apps","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"enterprise","cpe11":"*","cpe12":"x86","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"android","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office","cpe6":"2016","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"x64","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office","cpe6":"2016","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"x86","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office","cpe6":"2019","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"x64","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office","cpe6":"2019","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"x86","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office_long_term_servicing_channel","cpe6":"2021","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"-","cpe12":"x64","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office_long_term_servicing_channel","cpe6":"2021","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"-","cpe12":"x86","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office_long_term_servicing_channel","cpe6":"2021","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"macos","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office_long_term_servicing_channel","cpe6":"2024","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"-","cpe12":"x64","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office_long_term_servicing_channel","cpe6":"2024","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"-","cpe12":"x86","cpe13":"*"},{"cve_year":"2026","cve_id":"40363","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"microsoft","cpe5":"office_long_term_servicing_channel","cpe6":"2024","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"macos","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"40363","cve":"CVE-2026-40363","epss":"0.000570000","percentile":"0.180920000","score_date":"2026-05-28","updated_at":"2026-05-29 00:13:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-40363","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-05-13T03:56:45.249171Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-05-13T10:13:18.673Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft 365 Apps for Enterprise","vendor":"Microsoft","versions":[{"lessThan":"https://aka.ms/OfficeSecurityReleases","status":"affected","version":"16.0.1","versionType":"custom"}]},{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft Office 2016","vendor":"Microsoft","versions":[{"lessThan":"16.0.5552.1000","status":"affected","version":"16.0.0","versionType":"custom"}]},{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft Office 2019","vendor":"Microsoft","versions":[{"lessThan":"https://aka.ms/OfficeSecurityReleases","status":"affected","version":"19.0.0","versionType":"custom"}]},{"product":"Microsoft Office for Android","vendor":"Microsoft","versions":[{"lessThan":"16.0.19822.20190","status":"affected","version":"16.0.1","versionType":"custom"}]},{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft Office LTSC 2021","vendor":"Microsoft","versions":[{"lessThan":"https://aka.ms/OfficeSecurityReleases","status":"affected","version":"16.0.1","versionType":"custom"}]},{"platforms":["32-bit Systems","x64-based Systems"],"product":"Microsoft Office LTSC 2024","vendor":"Microsoft","versions":[{"lessThan":"https://aka.ms/OfficeSecurityReleases","status":"affected","version":"16.0.0","versionType":"custom"}]},{"product":"Microsoft Office LTSC for Mac 2021","vendor":"Microsoft","versions":[{"lessThan":"16.109.26051019","status":"affected","version":"16.0.1","versionType":"custom"}]},{"product":"Microsoft Office LTSC for Mac 2024","vendor":"Microsoft","versions":[{"lessThan":"16.109.26051019","status":"affected","version":"16.0.0","versionType":"custom"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*","versionEndExcluding":"https://aka.ms/OfficeSecurityReleases","versionStartIncluding":"19.0.0","vulnerable":true},{"criteria":"cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*","versionEndExcluding":"https://aka.ms/OfficeSecurityReleases","versionStartIncluding":"16.0.1","vulnerable":true},{"criteria":"cpe:2.3:a:microsoft:office_macos_2021:*:*:*:*:*:long_term_servicing_channel:*:*","versionEndExcluding":"16.109.26051019","versionStartIncluding":"16.0.1","vulnerable":true},{"criteria":"cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*","versionEndExcluding":"https://aka.ms/OfficeSecurityReleases","versionStartIncluding":"16.0.1","vulnerable":true},{"criteria":"cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*","versionEndExcluding":"https://aka.ms/OfficeSecurityReleases","versionStartIncluding":"16.0.0","vulnerable":true},{"criteria":"cpe:2.3:a:microsoft:office_macos_2024:*:*:*:*:*:long_term_servicing_channel:*:*","versionEndExcluding":"16.109.26051019","versionStartIncluding":"16.0.0","vulnerable":true},{"criteria":"cpe:2.3:a:microsoft:office_2016:*:*:*:*:*:*:x86:*","versionEndExcluding":"16.0.5552.1000","versionStartIncluding":"16.0.0","vulnerable":true},{"criteria":"cpe:2.3:a:microsoft:office:*:*:android:*:*:*:*:*","versionEndExcluding":"16.0.19822.20190","versionStartIncluding":"16.0.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"datePublic":"2026-05-12T14:00:00.000Z","descriptions":[{"lang":"en-US","value":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally."}],"metrics":[{"cvssV3_1":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en-US","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","description":"CWE-122: Heap-based Buffer Overflow","lang":"en-US","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-05-20T23:28:09.669Z","orgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","shortName":"microsoft"},"references":[{"name":"Microsoft Office Remote Code Execution Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40363"}],"title":"Microsoft Office Remote Code Execution Vulnerability"}},"cveMetadata":{"assignerOrgId":"f38d906d-7342-40ea-92c1-6c4a2c6478c8","assignerShortName":"microsoft","cveId":"CVE-2026-40363","datePublished":"2026-05-12T16:58:37.547Z","dateReserved":"2026-04-11T23:06:15.614Z","dateUpdated":"2026-05-20T23:28:09.669Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-12 18:17:15","lastModifiedDate":"2026-05-19 18:05:10","problem_types":["CWE-122","CWE-122 CWE-122: Heap-based Buffer Overflow"],"metrics":{"cvssMetricV31":[{"source":"secure@microsoft.com","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":5.9}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*","matchCriteriaId":"3259EBFE-AE2D-48B8-BE9A-E22BBDB31378"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*","matchCriteriaId":"CD25F492-9272-4836-832C-8439EBE64CCF"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office:*:*:*:*:*:android:*:*","versionEndExcluding":"16.0.19822.20190","matchCriteriaId":"D6226193-F09C-4C63-8020-E13666AED43D"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x64:*","matchCriteriaId":"72324216-4EB3-4243-A007-FEF3133C7DF9"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:x86:*","matchCriteriaId":"0FBB0E61-7997-4F26-9C07-54912D3F1C10"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*","matchCriteriaId":"CF5DDD09-902E-4881-98D0-CB896333B4AA"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*","matchCriteriaId":"26A3B226-5D7C-4556-9350-5222DC8EFC2C"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*","matchCriteriaId":"851BAC4E-9965-4F40-9A6C-B73D9004F4C1"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*","matchCriteriaId":"23B2FA23-76F4-4D83-A718-B8D04D7EA37B"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*","matchCriteriaId":"BF0E8112-5B6F-4E55-8E40-38ADCF6FC654"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*","matchCriteriaId":"D31E509A-0B2E-4B41-88C4-0099E800AFE6"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*","matchCriteriaId":"017A7041-BEF1-4E4E-AC8A-EFC6AFEB01FE"},{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:*","matchCriteriaId":"EF3E56B5-E6A6-4061-9380-D421E52B9199"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"40363","Ordinal":"1","Title":"Microsoft Office Remote Code Execution Vulnerability","CVE":"CVE-2026-40363","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"40363","Ordinal":"1","NoteData":"Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.","Type":"Description","Title":"Microsoft Office Remote Code Execution Vulnerability"}]}}}