It appears that Xbox Game Pass for PC has also added this old game.

I would highly recommend NOT to download and play this game!

If you are a Call of Duty fan who wanted to relive some past memories from playing the older titles, you should reconsider.

Due to an Remote Code Execution (RCE) exploit in the anti-cheat software used by the game, hackers can download and run anything they want to on your PC. Popup windows with messages, play explicit content on your screen, crash your game, and/or access your entire PC.

This has previously happened to other old Call of Duty titles as well. You could play them on your xBox safely, but not the PC.

Until the RCE exploit is fully solved in Call of Duty: Word War II, do not play any legacy Call of Duty title, as you could put your PC at risk.