Yes. Evacuate the house immediately and do not return. Call your insurance company and have them total the entire building and by you a new home. Tell your neighbors they should vacate the area as well.
It's not that serious. But yes. You should avoid all temptations to lick or touch the metal conductors of those wires directly with your skin. Whoever installed that light fixture was an idiot. And now you get to fix their mess:
Buy a multimeter or a non-contact voltage detector wand. Turn off the breaker to that fixture and use the NCVD or multimeter to make sure the circuit is de-energised. Then go to your nearest non-trademarked home center and buy some proper mounting screws for that thing. My best guess is some toggle bolts would do the trick. Use an appropriately sized drill bit to make a hole for the toggle bolts. If there's a stud very close by the wire then you might be able to use a wood screw with that, and only one toggle bolt.
Once that white bracket it affixed sturdily to the ceiling, put the light fixture back, or put a new one up if the old one busted to bits when it fell. This should be a single-day project, and a great intro to electrics for a novice. Enjoy!