Duplicate cumulative kb, Windows 11 update returns false information

I use the script presented here:

https://learn.microsoft.com/en-us/windows/win32/wua_sdk/using-wua-to-scan-for-updates-offline?tabs=vbscript

I just replace the filter with

Type='Software'

I can confirm that this bug is still present in Windows 11 25H2. The API keeps reporting older cumulative KBs as “installed” even when they are not. It’s really frustrating to see that nothing has changed after all this time.

I just saw that the problem is also visible on a wsus server (which seems logical). I have the impression that the 24h2 windows update engine is completely crap.

Is there still someone at the helm at Microsoft to take things in hand?

Hello,

If this is indeed a detectoid issue in the WUA API, it’s important to report it to Microsoft:

File Feedback:

Use the Feedback Hub app in Windows 11 to report the issue.

Provide detailed steps to reproduce the issue, including the WUA API query and the observed results.

Contact Microsoft Support:

Provide them with the following information:

Windows version (24H2).

WUA API query details.

Logs from Get-WindowsUpdateLog or dism /get-packages.

Best Regards,

Hania Lian

============================================

If the Answer is helpful, please click "Accept Answer" and upvote it.

I think that you just need to look at the IsInstalled peoperty.

I used the PowerShell version and made a slight change to the output.

$UpdateSession = New-Object -ComObject Microsoft.Update.Session
$UpdateServiceManager = New-Object -ComObject Microsoft.Update.ServiceManager
$UpdateService = $UpdateServiceManager.AddScanPackageService("Offline Sync Service", "c:\temp\wsusscn2.cab")
$UpdateSearcher = $UpdateSession.CreateUpdateSearcher()
Write-Host "Searching for updates..."
$UpdateSearcher.ServerSelection = 3 # ssOthers
$UpdateSearcher.ServiceID = [string] $UpdateService.ServiceID
$SearchResult = $UpdateSearcher.Search("Type='Software'")   #IsInstalled=0")
$Updates = $SearchResult.Updates
If ($SearchResult.Updates.Count -eq 0) {
    Write-Host "There are no applicable updates."
    return
}
Write-Host "List of applicable items on the machine when using wssuscan.cab:"
For ($i = 0; $i -lt $SearchResult.Updates.Count; $i++) {
    $update = $SearchResult.Updates.Item($i)
    #Write-Host ($i + 1) "> " $update.Title
    [PSCustomObject]@{
        IsInstalled = $update.IsInstalled
        Type = $update.Type
        Title = $update.Title
    }
}

On my Win11 laptop it reports this.

I have a Win10 VM that I don't use very often. It reports that it is missing some updates.

....