Lowest rated player to beat a 2800+ player?

What is the lowest rated player that has beaten a player rated 2800 or higher?

There are only 2 2800 rated players, Carlsen and Caruana. All you have to do is search for their results since they became rated over 2800. I'll bet one of the two has even lost to a 2600.

Here is an article in the spirit of what you were asking:

http://www.chess.com/article/view/the-greatest-chess-upsets-part-1

http://www.chess.com/article/view/the-greatest-chess-upsets-part-2

Disregarding simuls and quickplay, I've found this game :

Kssparov, Topalov, Kramnik & Aronian could also take part in it although only GK stayed there for a really really long time

43. Be7!!! wow....that's insane! (MSC157-GK and MC)

Carlsen lost to Ivan Saric in the 2014 olypiad, he's high 2600 though.

Uggh, in a Hedgehog, go figure -_- Would mean much more if he won against a Berlin Wall.

Who cares!!