Microsoft Excel Remote Code Execution and Security Feature Bypass Vulnerability (CVE-2016-7262)

# Install Windows Update module and check for missing Excel security updates
Install-Module PSWindowsUpdate -Force -Verbose
Get-WUList -MicrosoftUpdate | Where-Object { $_.Title -like '*Excel*' -or $_.KBArticleID -eq '3127983' }

# Install the specific security update for Excel
Install-WindowsUpdate -KBArticleID KB3127983 -AcceptAll -AutoReboot

# Force hyperlink warnings in Microsoft Office applications
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Office\16.0\Common\Security' -Name 'DisableHyperlinkWarning' -Value 0 -PropertyType DWord -Force

# Block external content execution from untrusted internet zones
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Office\16.0\Excel\Security' -Name 'BlockContentExecutionFromInternet' -Value 1 -PropertyType DWord -Force

# Audit script to check installed Excel version against vulnerable baselines
$ExcelPath = (Get-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\excel.exe' -ErrorAction SilentlyContinue).'(Default)'
if ($ExcelPath) {
    $ExcelVersion = (Get-Item $ExcelPath).VersionInfo.ProductVersion
    Write-Host 'Detected Excel Version:' $ExcelVersion -ForegroundColor Yellow
    # Example threshold check for Excel 2016
    if ([version]$ExcelVersion -lt [version]'16.0.4456.1003') {
        Write-Host '[WARNING] This system is running a vulnerable version of Excel and is susceptible to CVE-2016-7262.' -ForegroundColor Red
    } else {
        Write-Host '[OK] Excel is patched or running a secure version.' -ForegroundColor Green
    }
} else {
    Write-Host 'Excel is not installed on this system.' -ForegroundColor Green
}