The WSUS Scan File (wsusscn2.cab) is a database of security updates released by Microsoft for every version of Windows from 2000 to 11, and Microsoft Update products such as Office and SQL Server. You can use this file to determine which updates are missing on a PC, without being connected to the internet.
Download the scan file easily with:
iwr https://wsusscn2.cab -OutFile wsusscn2.cab
or curl.exe -L https://wsusscn2.cab -o wsusscn2.cab