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CVE-2026-45459— Microsoft Excel Security Feature Bypass 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.

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。攻击者利用该漏洞可以绕过某些功能。以下产品和版本受到影响：Microsoft 365 Apps for Enterprise for 32-bit Systems,Microsoft 365 Apps for Enterprise for 64-bit Systems,Microsoft Office LTSC for Mac 2021,Micro

CVSS 3.3 · Low EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 5

VendorProduct Version RangeStatus
Microsoft Microsoft 365 Apps for Enterprise 16.0.1< https://aka.ms/OfficeSecurityReleases affected
Microsoft Microsoft Office 365 for Mac 1.0.0< 16.110.26061317 affected
Microsoft Microsoft Office LTSC 2024 16.0.0< https://aka.ms/OfficeSecurityReleases affected
Microsoft Microsoft Office LTSC for Mac 2021 16.0.1< 16.110.26061317 affected
Microsoft Microsoft Office LTSC for Mac 2024 16.0.0< 16.110.26061317 affected
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I. Basic Information for CVE-2026-45459

Vulnerability Information
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Vulnerability Title
Microsoft Excel Security Feature Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Protection mechanism failure in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
保护机制失效
Source: CVE Program / CVE List V5
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。攻击者利用该漏洞可以绕过某些功能。以下产品和版本受到影响：Microsoft 365 Apps for Enterprise for 32-bit Systems,Microsoft 365 Apps for Enterprise for 64-bit Systems,Microsoft Office LTSC for Mac 2021,Micro
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

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft 365 Apps for Enterprise 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
Microsoft Microsoft Office 365 for Mac 1.0.0 ~ 16.110.26061317 -
Microsoft Microsoft Office LTSC 2024 16.0.0 ~ https://aka.ms/OfficeSecurityReleases -
Microsoft Microsoft Office LTSC for Mac 2021 16.0.1 ~ 16.110.26061317 -
Microsoft Microsoft Office LTSC for Mac 2024 16.0.0 ~ 16.110.26061317 -

II. Public POCs for CVE-2026-45459

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III. Intelligence Information for CVE-2026-45459

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Vendor Advisories for CVE-2026-45459 (1)

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

CVE-2026-26142 9.8 CRITICAL Nuance PowerScribe Remote Code Execution Vulnerability
CVE-2026-47643 9.8 CRITICAL Azure Stack Edge Remote Code Execution Vulnerability
CVE-2026-45657 9.8 CRITICAL Windows Kernel Remote Code Execution Vulnerability
CVE-2026-44815 9.8 CRITICAL DHCP Client Service Remote Code Execution Vulnerability
CVE-2026-47291 9.8 CRITICAL HTTP.sys Remote Code Execution Vulnerability
CVE-2026-47281 9.6 CRITICAL Visual Studio Code Elevation of Privilege Vulnerability
CVE-2026-42904 9.6 CRITICAL Windows TCP/IP Elevation of Privilege Vulnerability
CVE-2026-45602 9.1 CRITICAL Windows Dynamic Host Configuration Protocol (DHCP) Tampering Vulnerability
CVE-2026-47289 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-45504 8.8 HIGH Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2026-45648 8.8 HIGH Windows Active Directory Domain Services Remote Code Execution Vulnerability
CVE-2026-32193 8.8 HIGH Azure Kubernetes Service (AKS) Remote Code Execution Vulnerability
CVE-2026-40371 8.8 HIGH Microsoft Dynamics 365 (on-premises) Elevation of Privilege Vulnerability
CVE-2026-45484 8.8 HIGH Microsoft SharePoint Elevation of Privilege Vulnerability
CVE-2026-47653 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-42985 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-47635 8.4 HIGH Microsoft Outlook and Word Remote Code Execution Vulnerability
CVE-2026-45461 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45463 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45607 8.4 HIGH Windows 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-693

V. Comments for CVE-2026-45459

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