Hey guys, I recently set up my Steam Deck, and wanted to use Discord like I would on a PC. I followed the usual guides to get it set up.
What I noticed is that when I had a game open, all my inputs would still go to the game - I couldn't interact with the Discord window, and my push-to-talk/push-to-mute keybinds wouldn't go to Discord while in game.
How I fixed this (at least in one game - Battlebit Remastered), was to edit the game's video settings to Fullscreen Windowed instead of Fullscreen. Edit: Worked for Splitgate too
This let me interact with Discord while the game had focus.
Maybe this will help you and with other games.
Highly depends on your definitions of the words "vulnerabilities," "Windows," and "patched." By Microsoft's definitions of these words, the answer would be no.