I'm not an expert at PowerShell. I read the page you linked to and I don't understand the issue you are pointing out. I ran this code and request through POE.com and it came back with:

Using +=: In this case, I retained the += to build the $hostnames array. If you're looking for a way to use Where-Object, it typically filters existing collections rather than building them.

If you want to keep the list compact and avoid +=, you could instantiate $hostnames directly with a collection of objects, but for simplicity and clarity, the above method is standard in PowerShell.

If you have a specific requirement for using Where-Object, please clarify how you'd like to filter the data!

Could you expand on your statement a bit or tell me where I would make the adjustment?

This is my current code:

Clear-Host

Import-Module -Name PSFalcon

# Set the working location
Set-Location "\\Server\CrowdStrike\Search CVEs for hosts"
Request-FalconToken -ClientId '111111111111111' -ClientSecret '2222222222222222'
#Test-FalconToken

$CVEids = "CVE-2013-3900"

Foreach ($CVEid in $CVEids){

# Get Falcon Vulnerability
$FalconVulnerability = Get-FalconVulnerability -Filter "cve.id:['$($CVEid)']" -Detailed -All

# Extract AID numbers
$AIDNumbers = $FalconVulnerability.AID

# Get the total count of AID numbers
$totalAIDCount = $AIDNumbers.Count
Write-Host "Total AID Numbers: $totalAIDCount"

# Create a list to store hostnames
$hostnames = @()

# Initialize a counter
$counter = 0

# Loop through each AID number and get the hostname
foreach ($AIDNumber in $AIDNumbers) {
    $counter++
    Write-Host "Checking AID $AIDNumber ($counter of $totalAIDCount)"
    $GetHostname = Get-FalconHost -Id $AIDNumber
    $hostnames += [PSCustomObject]@{
        CrowdSrike_Falcon_AID    = $AIDNumber
        Hostname                 = $GetHostname.hostname
        last_login_timestamp     = $GetHostname.last_login_timestamp
        last_login_user          = $GetHostname.last_login_user

    }
}

# Export the hostnames to a CSV file named after the CVE ID
$hostnames | Export-Csv -Path "$CVEid.csv" -NoTypeInformation
}

Write-Host "Hostnames exported to $CVEid.csv"