{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-65661", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-07-22T18:16:01.897Z", "datePublished": "2026-08-11T17:04:54.481Z", "dateUpdated": "2026-08-11T19:17:57.345Z"}, "containers": {"cna": {"title": "Microsoft Office Remote Code Execution Vulnerability", "datePublic": "2026-08-11T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*", "versionStartIncluding": "16.0.1", "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*", "versionStartIncluding": "16.0.1", "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*", "versionStartIncluding": "16.0.0", "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_2016:*:*:*:*:*:*:x86:*", "versionStartIncluding": "16.0.0", "versionEndExcluding": "16.0.5565.1001"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*", "versionStartIncluding": "19.0.0", "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft 365 Apps for Enterprise", "platforms": ["32-bit Systems", "x64-based Systems"], "versions": [{"version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft Office 2016", "platforms": ["32-bit Systems", "x64-based Systems"], "versions": [{"version": "16.0.0", "lessThan": "16.0.5565.1001", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft Office 2019", "platforms": ["32-bit Systems", "x64-based Systems"], "versions": [{"version": "19.0.0", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft Office LTSC 2021", "platforms": ["32-bit Systems", "x64-based Systems"], "versions": [{"version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft Office LTSC 2024", "platforms": ["32-bit Systems", "x64-based Systems"], "versions": [{"version": "16.0.0", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-122: Heap-based Buffer Overflow", "lang": "en-US", "type": "CWE", "cweId": "CWE-122"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-08-11T19:17:57.345Z"}, "references": [{"name": "Microsoft Office Remote Code Execution Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65661"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "HIGH", "baseScore": 7.8, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C"}}]}}}

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{"affected": [{"affectedData": [{"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": "16.0.5565.1001", "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"}]}, {"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"}]}], "source": "secure@microsoft.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally."}], "id": "CVE-2026-65661", "lastModified": "2026-08-11T18:53:42.910", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "secure@microsoft.com", "type": "Primary"}]}, "published": "2026-08-11T17:18:54.203", "references": [{"source": "secure@microsoft.com", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65661"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "secure@microsoft.com", "type": "Primary"}]}

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