CVE-2026-40421
Full vulnerability record from the local CVENow database.
Description
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Severity
MEDIUM
CVSS score
4.3
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-05-12 18:17:20.320000
Last modified
2026-10-26 18:10:00.173000
View original CVE JSON
{
"id": "CVE-2026-40421",
"sourceIdentifier": "[email protected]",
"published": "2026-05-12T18:17:20.320",
"lastModified": "2026-10-26T18:10:00.173",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally."
},
{
"lang": "es",
"value": "Archivos o directorios accesibles a terceros externos en Microsoft Office Word permite a un atacante no autorizado divulgar información localmente."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"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"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 2.8,
"impactScore": 1.4
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-05-13T19:25:18.344080Z",
"id": "CVE-2026-40421",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-73"
}
]
}
],
"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: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"
}
]
}
]
}
],
"references": [
{
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
}
]
}