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CVE-2026-66810— Microsoft Office Word Information Disclosure Vulnerability

CVSS 5.5 · Medium EPSS 0.28% · P20

Possible ATT&CK Techniques 1AI

T1005 · Data from Local System

Affected Version Matrix 8

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< 16.112.26081010affected
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
MicrosoftMicrosoft Word 201616.0.1< 16.0.5565.1000affected
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I. Basic Information for CVE-2026-66810

Vulnerability Information
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Vulnerability Title
Microsoft Office Word Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information 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:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Office Word 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Office Word是美国Microsoft公司的一款文字处理软件。 Microsoft Office Word存在缓冲区错误漏洞，该漏洞源于堆缓冲区溢出，可能导致未经授权的攻击者在本地泄露信息。
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 ~ 16.112.26081010 -
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 -
MicrosoftMicrosoft Word 2016 16.0.1 ~ 16.0.5565.1000 -

II. Public POCs for CVE-2026-66810

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III. Intelligence Information for CVE-2026-66810

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Vendor Advisories for CVE-2026-66810 (1)

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

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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-122

V. Comments for CVE-2026-66810

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