I run Debian 13 with MATE. I recently switched from the distro release to the flatpak version of FreeCAD, as the distro release is of course a few versions behind. Bear with me, as I am very new to using Flatpak or anything other than normal apt packages.
I just noticed that FreeCAD announces it is running as super user in the window title bar.
The interesting part is it doesn't ask for privilege escalation with password entry when I launch it.
Seeing as FreeCAD never ran as SU with the distro release installed via apt, and I don't think the program does anything that really needs SU... As much as I trust FreeCAD, this seems like a security hole I'd rather not have.
Is the Flatpak version running inside it's own "box" and it isn't getting SU permissions across my whole system? Or what am I missing here.
Neat! I see why people prefer flatpaks these days with keeping each install sandboxed.
The uid 0 part I think is why it shows SU, based on IanTwenty's comment. Apparently a longstanding bug in MATE.