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CVE-2026-44817— Microsoft Excel Remote Code Execution Vulnerability

CVSS 7.8 · High EPSS 0.37% · P29

Affected Version Matrix 9

VendorProductVersion RangeStatus
MicrosoftMicrosoft 365 Apps for Enterprise16.0.1< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Excel 201616.0.0.0< 16.0.5556.1001affected
MicrosoftMicrosoft Office 201919.0.0< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office 365 for Mac-affected
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 2021-affected
MicrosoftMicrosoft Office LTSC for Mac 2024-affected
MicrosoftOffice Online Server16.0.0.0< 16.0.10417.20137affected
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I. Basic Information for CVE-2026-44817

Vulnerability Information
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Vulnerability Title
Microsoft Excel Remote Code Execution Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Office Excel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Office Excel是美国微软（Microsoft）开源的一款电子表格软件。 Microsoft Office Excel存在安全漏洞，该漏洞源于整数下溢，可能导致未授权攻击者本地执行代码。
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 Excel 2016 16.0.0.0 ~ 16.0.5556.1001 -
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 -
MicrosoftOffice Online Server 16.0.0.0 ~ 16.0.10417.20137 -

II. Public POCs for CVE-2026-44817

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III. Intelligence Information for CVE-2026-44817

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Vendor Advisories for CVE-2026-44817 (1)

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

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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-2026-456078.4 HIGHWindows Hyper-V Remote Code Execution Vulnerability
CVE-2026-454728.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-454638.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-476358.4 HIGHMicrosoft Outlook and Word 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-2026-44817

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