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CVE-2026-20957

Microsoft Office - Excel

Microsoft CVSS 7.8 Updated March 15, 2026

Executive Risk Summary

"An integer underflow vulnerability in Microsoft Office Excel allows an unauthorized attacker to execute code locally, potentially leading to a complete system compromise. This vulnerability can be exploited by an attacker to gain control over the affected system, emphasizing the need for immediate patching."

Operational Audit Arsenal

Target Type DLL
Target Asset excel.exe
Standard Path %ProgramFiles%\Microsoft Office\Root\Office16
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: excel.exe (DLL)
$Targets = 'excel.exe'
$SearchPaths = @("$env:windir\System32", "$env:ProgramFiles", "${env:ProgramFiles(x86)}")

Get-ChildItem -Path $SearchPaths -Include $Targets -Recurse -ErrorAction SilentlyContinue | 
Select-Object FullName, @{Name="Version";Expression={$_.VersionInfo.ProductVersion}}

Patch Impact Forecast

Reboot Required Likely

Moderate, as users may need to restart their systems after applying the patch

Internal Work Notes

High-risk vulnerability in Microsoft Office Excel requiring immediate patching to prevent code execution attacks

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Intelligence Sources

Related Microsoft Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.