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CVE-2026-40421— Microsoft Word Information Disclosure Vulnerability

CVSS 4.3 · Medium EPSS 0.05% · P15

Possible ATT&CK Techniques 1AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 5

VendorProductVersion RangeStatus
MicrosoftMicrosoft 365 Apps for Enterprise16.0.1< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office 201919.0.0< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office LTSC 202116.0.1< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office LTSC 202416.0.0< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Word 201616.0.1< 16.0.5552.1000affected
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I. Basic Information for CVE-2026-40421

Vulnerability Information
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Vulnerability Title
Microsoft Word Information Disclosure Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
文件名或路径的外部可控制
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Word 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Word是美国微软（Microsoft）公司的一套Office套件中的文字处理软件。 Microsoft Word存在安全漏洞。攻击者利用该漏洞可以获取敏感信息。以下产品和版本受到影响：Microsoft 365 Apps for Enterprise for 64-bit Systems,Microsoft Office LTSC 2021 for 64-bit editions,Microsoft Office LTSC 2021 for 32-bit editions,Micro
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MicrosoftMicrosoft 365 Apps for Enterprise 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office 2019 19.0.0 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office LTSC 2021 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office LTSC 2024 16.0.0 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Word 2016 16.0.1 ~ 16.0.5552.1000 -

II. Public POCs for CVE-2026-40421

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III. Intelligence Information for CVE-2026-40421

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Same Patch Batch · Microsoft · 2026-05-12 · 125 CVEs total

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CVE-2026-410899.8 CRITICALWindows Netlogon Remote Code Execution Vulnerability
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CVE-2026-403799.3 CRITICALAzure Entra ID Spoofing Vulnerability
CVE-2026-428339.1 CRITICALMicrosoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-331179.1 CRITICALAzure SDK for Java Security Feature Bypass Vulnerability
CVE-2026-411039.1 CRITICALMicrosoft SSO Plugin for Jira & Confluence Elevation of Privilege Vulnerability
CVE-2026-411098.8 HIGHGitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability
CVE-2026-404038.8 HIGHWindows Graphics Component Remote Code Execution Vulnerability
CVE-2026-403578.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-354368.8 HIGHMicrosoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-354398.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-404208.8 HIGHMicrosoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-410868.8 HIGHWindows Admin Center in Azure Portal Elevation of Privilege Vulnerability
CVE-2026-331128.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-343298.8 HIGHMicrosoft Message Queuing (MSMQ) Remote Code Execution Vulnerability
CVE-2026-403658.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-416138.8 HIGHVisual Studio Code Elevation of Privilege Vulnerability

Showing top 20 of 125 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft 365 Apps for Enterprise
Same vendor: Microsoft
Same weakness: CWE-73

V. Comments for CVE-2026-40421

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