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CVE-2026-45456— Microsoft Outlook and Word Remote Code Execution Vulnerability

CVSS 8.4 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 11

VendorProductVersion RangeStatus
MicrosoftMicrosoft 365 Apps for Enterprise16.0.1< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office 201919.0.0< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office 365 for Mac1.0.0< 16.110.26061317affected
MicrosoftMicrosoft Office LTSC 202116.0.1< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office LTSC 202416.0.0< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office LTSC for Mac 202116.0.1< 16.110.26061317affected
MicrosoftMicrosoft Office LTSC for Mac 202416.0.0< 16.110.26061317affected
MicrosoftMicrosoft SharePoint Enterprise Server 201616.0.0< 16.0.5556.1005affected
MicrosoftMicrosoft SharePoint Server 201916.0.0< 16.0.10417.20153affected
MicrosoftMicrosoft SharePoint Server Subscription Edition16.0.0< 16.0.19725.20384affected
MicrosoftMicrosoft Word 201616.0.1< 16.0.5556.1000affected
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I. Basic Information for CVE-2026-45456

Vulnerability Information
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Vulnerability Title
Microsoft Outlook and Word Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Access of resource using incompatible type ('type confusion') in Microsoft Office 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
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Office 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Office是美国微软（Microsoft）公司的一款办公软件套件产品。该产品常用组件包括Word、Excel、Access、Powerpoint、FrontPage等。 Microsoft Office存在安全漏洞，该漏洞源于类型混淆，可能导致未经授权的攻击者在本地执行代码。
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 365 for Mac 1.0.0 ~ 16.110.26061317 -
MicrosoftMicrosoft Office LTSC 2021 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office LTSC 2024 16.0.0 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office LTSC for Mac 2021 16.0.1 ~ 16.110.26061317 -
MicrosoftMicrosoft Office LTSC for Mac 2024 16.0.0 ~ 16.110.26061317 -
MicrosoftMicrosoft SharePoint Enterprise Server 2016 16.0.0 ~ 16.0.5556.1005 -
MicrosoftMicrosoft SharePoint Server 2019 16.0.0 ~ 16.0.10417.20153 -
MicrosoftMicrosoft SharePoint Server Subscription Edition 16.0.0 ~ 16.0.19725.20384 -
MicrosoftMicrosoft Word 2016 16.0.1 ~ 16.0.5556.1000 -

II. Public POCs for CVE-2026-45456

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III. Intelligence Information for CVE-2026-45456

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Vendor Advisories for CVE-2026-45456 (1)

Same Patch Batch · Microsoft · 2026-06-09 · 200 CVEs total

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CVE-2026-261429.8 CRITICALNuance PowerScribe Remote Code Execution Vulnerability
CVE-2026-472919.8 CRITICALHTTP.sys Remote Code Execution Vulnerability
CVE-2026-456579.8 CRITICALWindows Kernel Remote Code Execution Vulnerability
CVE-2026-448159.8 CRITICALDHCP Client Service Remote Code Execution Vulnerability
CVE-2026-472819.6 CRITICALVisual Studio Code Elevation of Privilege Vulnerability
CVE-2026-429049.6 CRITICALWindows TCP/IP Elevation of Privilege Vulnerability
CVE-2026-456029.1 CRITICALWindows Dynamic Host Configuration Protocol (DHCP) Tampering Vulnerability
CVE-2026-321938.8 HIGHAzure Kubernetes Service (AKS) Remote Code Execution Vulnerability
CVE-2026-454848.8 HIGHMicrosoft SharePoint Elevation of Privilege Vulnerability
CVE-2026-403718.8 HIGHMicrosoft Dynamics 365 (on-premises) Elevation of Privilege Vulnerability
CVE-2026-476538.8 HIGHRemote Desktop Client Remote Code Execution Vulnerability
CVE-2026-472898.8 HIGHRemote Desktop Client Remote Code Execution Vulnerability
CVE-2026-456488.8 HIGHWindows Active Directory Domain Services Remote Code Execution Vulnerability
CVE-2026-455048.8 HIGHMicrosoft Exchange Server Elevation of Privilege Vulnerability
CVE-2026-429858.8 HIGHRemote Desktop Client Remote Code Execution Vulnerability
CVE-2026-454828.4 HIGHMicrosoft Visual Studio Code CoPilot Chat Security Feature Bypass Vulnerability
CVE-2026-454618.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-454728.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-456418.4 HIGHWindows Hyper-V Remote Code Execution Vulnerability

Showing top 20 of 200 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft 365 Apps for Enterprise
Same vendor: Microsoft
Same weakness: CWE-843

V. Comments for CVE-2026-45456

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