His late winner was enough for Premier League high-fliers Aston Villa to progress to the fourth round.
Carabao Cup semi-finalists Boro were denied another cup run when Cash’s deflected strike found the bottom corner of the net in the 87th minute.
The Premier League side had threatened from corners in the second half and a set-piece ultimately proved to be Boro’s undoing as Unai Emery’s side prevailed.
The first chance of the contest fell to Villa when Boubacar Kamara flicked the ball to Jhon Duran, who cut in from the left and fired towards the bottom corner, but goalkeeper Tom Glover stuck out a leg to turn the ball behind.
The visitors grew into the game and Alex Moreno caused problems with some dangerous crosses, one finding Cash who smashed the ball into the crowded Boro box.
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