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CVE-2026-64909— Microsoft Office Remote Code Execution Vulnerability

CVSS 7.8 · High EPSS 0.35% · P28

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 8

VendorProductVersion RangeStatus
MicrosoftMicrosoft 365 Apps for Enterprise16.0.1< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office 201616.0.0< 16.0.5565.1001affected
MicrosoftMicrosoft Office 201919.0.0< https://aka.ms/OfficeSecurityReleasesaffected
MicrosoftMicrosoft Office 365 for Mac1.0.0< 16.112.26081010affected
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< 16.112.26081010affected
MicrosoftMicrosoft Office LTSC for Mac 202416.0.0< 16.112.26081010affected
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I. Basic Information for CVE-2026-64909

Vulnerability Information
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Vulnerability Title
Microsoft Office Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Integer underflow (wrap or wraparound) 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:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Office 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Office是美国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，该漏洞源于整数下溢问题，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 2016 16.0.0 ~ 16.0.5565.1001 -
MicrosoftMicrosoft Office 2019 19.0.0 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office 365 for Mac 1.0.0 ~ 16.112.26081010 -
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 ~ 16.112.26081010 -
MicrosoftMicrosoft Office LTSC for Mac 2024 16.0.0 ~ 16.112.26081010 -

II. Public POCs for CVE-2026-64909

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III. Intelligence Information for CVE-2026-64909

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Vendor Advisories for CVE-2026-64909 (1)

Same Patch Batch · Microsoft · 2026-08-11 · 402 CVEs total

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CVE-2026-627908.8 HIGHWindows SMBv3 Server Remote Code Execution Vulnerability
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CVE-2026-628228.8 HIGHWindows GDI+ Remote Code Execution Vulnerability
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Showing top 20 of 402 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft 365 Apps for Enterprise
Same vendor: Microsoft
Same weakness: CWE-191

V. Comments for CVE-2026-64909

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