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CVE-2026-26109

Microsoft Office Excel

Microsoft CVSS 8.4 Updated March 15, 2026

Executive Risk Summary

"A critical vulnerability in Microsoft Office Excel allows an unauthorized attacker to execute code locally through an out-of-bounds read. This vulnerability poses a significant risk to systems with Microsoft Office Excel installed, as it could lead to code execution and potential system compromise."

Operational Audit Arsenal

Target Type Executable
Target Asset excel.exe
Standard Path %ProgramFiles%\Microsoft Office\Root\Office16\EXCEL.EXE
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: excel.exe (Executable)
$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

Microsoft Office services may be affected

Internal Work Notes

High-priority patching required for Microsoft Office Excel to mitigate out-of-bounds read vulnerability (CVE-2026-26109)

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Intelligence Sources

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