If there's anything sensisitve open on a tmux window somewhere it's just sitting in a file in your hard drive. It's overwritten every 10 minutes by whatever is there.

If that's a password for some reason, it could be captured.

I just thought it was going to be the sessions, window names, layouts. I wasn't expecting the content too. Not a big deal for me, but a surprise!

Ooh yeah. Very good point