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CVE-2026-40366— Microsoft Word Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Microsoft 365 Apps for Enterprise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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存在资源管理错误漏洞。攻击者利用该漏洞可以远程执行代码。以下产品和版本受到影响：Microsoft Office 2019 for 32-bit editions,Microsoft Office 2019 for 64-bit editions,Microsoft 365 Apps for Enterprise for 32-bit Systems,Microsoft 3

CVSS 8.4 · High EPSS 0.38% · P31

Affected Version Matrix 7

VendorProduct Version RangeStatus
Microsoft Microsoft 365 Apps for Enterprise 16.0.1< https://aka.ms/OfficeSecurityReleases affected
Microsoft Microsoft Office 2019 19.0.0< https://aka.ms/OfficeSecurityReleases affected
Microsoft Microsoft Office LTSC 2021 16.0.1< https://aka.ms/OfficeSecurityReleases affected
Microsoft Microsoft Office LTSC 2024 16.0.0< https://aka.ms/OfficeSecurityReleases affected
Microsoft Microsoft Office LTSC for Mac 2021 16.0.1< 16.109.26051019 affected
Microsoft Microsoft Office LTSC for Mac 2024 16.0.0< 16.109.26051019 affected
Microsoft Microsoft Word 2016 16.0.1< 16.0.5552.1000 affected
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I. Basic Information for CVE-2026-40366

Vulnerability Information
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Vulnerability Title
Microsoft Word Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Word 资源管理错误漏洞
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存在资源管理错误漏洞。攻击者利用该漏洞可以远程执行代码。以下产品和版本受到影响：Microsoft Office 2019 for 32-bit editions,Microsoft Office 2019 for 64-bit editions,Microsoft 365 Apps for Enterprise for 32-bit Systems,Microsoft 3
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

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft 365 Apps for Enterprise 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
Microsoft Microsoft Office 2019 19.0.0 ~ https://aka.ms/OfficeSecurityReleases -
Microsoft Microsoft Office LTSC 2021 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
Microsoft Microsoft Office LTSC 2024 16.0.0 ~ https://aka.ms/OfficeSecurityReleases -
Microsoft Microsoft Office LTSC for Mac 2021 16.0.1 ~ 16.109.26051019 -
Microsoft Microsoft Office LTSC for Mac 2024 16.0.0 ~ 16.109.26051019 -
Microsoft Microsoft Word 2016 16.0.1 ~ 16.0.5552.1000 -

II. Public POCs for CVE-2026-40366

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III. Intelligence Information for CVE-2026-40366

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Vendor Advisories for CVE-2026-40366 (1)

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

CVE-2026-42898 9.9 CRITICAL Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-42823 9.9 CRITICAL Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-41089 9.8 CRITICAL Windows Netlogon Remote Code Execution Vulnerability
CVE-2026-41096 9.8 CRITICAL Windows DNS Client Remote Code Execution Vulnerability
CVE-2026-40379 9.3 CRITICAL Azure Entra ID Spoofing Vulnerability
CVE-2026-40402 9.3 CRITICAL Windows Hyper-V Elevation of Privilege Vulnerability
CVE-2026-42833 9.1 CRITICAL Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-33117 9.1 CRITICAL Azure SDK for Java Security Feature Bypass Vulnerability
CVE-2026-41103 9.1 CRITICAL Microsoft SSO Plugin for Jira & Confluence Elevation of Privilege Vulnerability
CVE-2026-40357 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-40365 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-40370 8.8 HIGH SQL Server Remote Code Execution Vulnerability
CVE-2026-41094 8.8 HIGH Microsoft Data Formulator Remote Code Execution Vulnerability
CVE-2026-35439 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-40403 8.8 HIGH Windows Graphics Component Remote Code Execution Vulnerability
CVE-2026-41109 8.8 HIGH GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability
CVE-2026-35436 8.8 HIGH Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-40420 8.8 HIGH Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-33110 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-34329 8.8 HIGH Microsoft Message Queuing (MSMQ) Remote Code Execution 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-416

V. Comments for CVE-2026-40366

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