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CVE-2026-81401— Microsoft Excel Information Disclosure 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.

在 Microsoft Office Excel 中，由于使用不兼容类型访问资源（“类型混淆”），未经授权的本地攻击者可能会泄露信息。

CVSS 5.5 · Medium

Affected Version Matrix 10

VendorProduct Version RangeStatus
Microsoft Microsoft 365 Apps for Enterprise 16.0.1< 16.0.20326.20138 affected
Microsoft Microsoft Excel 2016 16.0.0.0< 16.0.5569.1003 affected
Microsoft Microsoft Office 2016 16.0.0< 16.0.5569.1003 affected
Microsoft Microsoft Office 2019 19.0.0< 16.0.10417.20207 affected
Microsoft Microsoft Office 365 for Mac - affected
Microsoft Microsoft Office LTSC 2021 16.0.1< 16.0.14334.20906 affected
Microsoft Microsoft Office LTSC 2024 16.0.0< 16.0.17932.20976 affected
Microsoft Microsoft Office LTSC for Mac 2021 - affected
Microsoft Microsoft Office LTSC for Mac 2024 - affected
Microsoft Office Online Server 16.0.0.0< 16.0.10417.20207 affected
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I. Basic Information for CVE-2026-81401

Vulnerability Information
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Vulnerability Title
Microsoft Excel Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Access of resource using incompatible type ('type confusion') in Microsoft Office Excel 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
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft 365 Apps for Enterprise 16.0.1 ~ 16.0.20326.20138 -
Microsoft Microsoft Excel 2016 16.0.0.0 ~ 16.0.5569.1003 -
Microsoft Microsoft Office 2016 16.0.0 ~ 16.0.5569.1003 -
Microsoft Microsoft Office 2019 19.0.0 ~ 16.0.10417.20207 -
Microsoft Microsoft Office 365 for Mac - -
Microsoft Microsoft Office LTSC 2021 16.0.1 ~ 16.0.14334.20906 -
Microsoft Microsoft Office LTSC 2024 16.0.0 ~ 16.0.17932.20976 -
Microsoft Microsoft Office LTSC for Mac 2021 - -
Microsoft Microsoft Office LTSC for Mac 2024 - -
Microsoft Office Online Server 16.0.0.0 ~ 16.0.10417.20207 -

II. Public POCs for CVE-2026-81401

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III. Intelligence Information for CVE-2026-81401

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Vendor Advisories for CVE-2026-81401 (1)

Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total

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CVE-2026-69769 9.8 CRITICAL Windows HTTP Print Provider Remote Code Execution Vulnerability
CVE-2026-69829 9.8 CRITICAL Windows Shell Remote Code Execution Vulnerability
CVE-2026-73025 9.8 CRITICAL Windows iSCSI Security Feature Bypass Vulnerability
CVE-2026-73009 9.8 CRITICAL Windows Secure Socket Tunneling Protocol (SSTP) Remote Code Execution Vulnerability
CVE-2026-69824 9.8 CRITICAL Microsoft Standard XPS Remote Code Execution Vulnerability
CVE-2026-78445 9.8 CRITICAL Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability

Showing top 20 of 966 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-2026-81401

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