{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40421", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-04-13T00:27:50.799Z", "datePublished": "2026-05-12T16:58:48.710Z", "dateUpdated": "2026-06-01T23:44:07.414Z"}, "containers": {"cna": {"title": "Microsoft Word Information Disclosure Vulnerability", "datePublic": "2026-05-12T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*", "versionStartIncluding": "19.0.0", "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases"}, {"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:word_2016:*:*:*:*:*:*:*:*", "versionStartIncluding": "16.0.1", "versionEndExcluding": "16.0.5552.1000"}]}]}], "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 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"}]}, {"vendor": "Microsoft", "product": "Microsoft Word 2016", "platforms": ["32-bit Systems", "x64-based Systems"], "versions": [{"version": "16.0.1", "lessThan": "16.0.5552.1000", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-73: External Control of File Name or Path", "lang": "en-US", "type": "CWE", "cweId": "CWE-73"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-06-01T23:44:07.414Z"}, "references": [{"name": "Microsoft Word Information Disclosure Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 4.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-13T19:25:18.344080Z", "id": "CVE-2026-40421", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-13T19:32:43.499Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-40421", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-13T19:25:18.344080Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-13T19:32:37.853Z"}}], "cna": {"title": "Microsoft Word Information Disclosure Vulnerability", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 4.3, "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C"}, "scenarios": [{"lang": "en-US", "value": "GENERAL"}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft 365 Apps for Enterprise", "versions": [{"status": "affected", "version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Office 2019", "versions": [{"status": "affected", "version": "19.0.0", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Office LTSC 2021", "versions": [{"status": "affected", "version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Office LTSC 2024", "versions": [{"status": "affected", "version": "16.0.0", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Word 2016", "versions": [{"status": "affected", "version": "16.0.1", "lessThan": "16.0.5552.1000", "versionType": "custom"}], "platforms": ["32-bit Systems", "x64-based Systems"]}], "datePublic": "2026-05-12T14:00:00.000Z", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421", "name": "Microsoft Word Information Disclosure Vulnerability", "tags": ["vendor-advisory", "patch"]}], "descriptions": [{"lang": "en-US", "value": "Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "CWE", "cweId": "CWE-73", "description": "CWE-73: External Control of File Name or Path"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases", "versionStartIncluding": "19.0.0"}, {"criteria": "cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*", "vulnerable": true, "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases", "versionStartIncluding": "16.0.1"}, {"criteria": "cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*", "vulnerable": true, "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases", "versionStartIncluding": "16.0.1"}, {"criteria": "cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*", "vulnerable": true, "versionEndExcluding": "https://aka.ms/OfficeSecurityReleases", "versionStartIncluding": "16.0.0"}, {"criteria": "cpe:2.3:a:microsoft:word_2016:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "16.0.5552.1000", "versionStartIncluding": "16.0.1"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-06-01T23:44:07.414Z"}}}, "cveMetadata": {"cveId": "CVE-2026-40421", "state": "PUBLISHED", "dateUpdated": "2026-06-01T23:44:07.414Z", "dateReserved": "2026-04-13T00:27:50.799Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2026-05-12T16:58:48.710Z", "assignerShortName": "microsoft"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"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: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:2024:*:*:*:ltsc:*:x64:*", "matchCriteriaId": "19F65776-446D-404C-A830-990D4232791A", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:*:x86:*", "matchCriteriaId": "017875F7-5396-4069-9F9F-0BDA05143A25", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x64:*", "matchCriteriaId": "75F7306B-D1DA-48C2-AF87-4480E161D794", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x86:*", "matchCriteriaId": "BA9BCD55-F71E-4920-B906-A1386843776A", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*", "matchCriteriaId": "E1FE9E95-4874-46EF-AC93-9E485F7A2AC0", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*", "matchCriteriaId": "38479B5D-66F9-4260-A18A-F6E3D9B6991E", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally."}], "id": "CVE-2026-40421", "lastModified": "2026-06-01T19:16:39.447", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "secure@microsoft.com", "type": "Secondary"}]}, "published": "2026-05-12T18:17:20.320", "references": [{"source": "secure@microsoft.com", "tags": ["Vendor Advisory"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-73"}], "source": "secure@microsoft.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["32-bit_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[16.0.1,*]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft 365 Apps for Enterprise", "source": "cna", "vendor": "Microsoft"}, "product": "365_apps", "vendor": "microsoft"}, {"configurations": [{"platform": ["32-bit_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[19.0.0,*]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Office 2019", "source": "cna", "vendor": "Microsoft"}, "product": "office_2019", "vendor": "microsoft"}, {"configurations": [{"platform": ["32-bit_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[16.0.1,*]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Office LTSC 2021", "source": "cna", "vendor": "Microsoft"}, "product": "office_2021", "vendor": "microsoft"}, {"configurations": [{"platform": ["32-bit_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[16.0.0,*]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Office LTSC 2024", "source": "cna", "vendor": "Microsoft"}, "product": "office_2024", "vendor": "microsoft"}, {"configurations": [{"platform": ["32-bit_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[16.0.1,16.0.5552.1000)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Word 2016", "source": "cna", "vendor": "Microsoft"}, "product": "word_2016", "vendor": "microsoft"}], "created": "2026-05-12T20:15:24.319957+00:00", "updated": "2026-06-01T21:45:22.634611+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$365_apps", "microsoft$PRODUCT$office_2019", "microsoft$PRODUCT$office_2021", "microsoft$PRODUCT$office_2024", "microsoft$PRODUCT$word_2016"]}