With the win Idaho (7-6) goes to 2-0 in its return to the Big Sky while Weber State (5-8), the preseason conference favorite, falls to 0-2 on its season-opening road trip.
Sekou Wiggs led the Vandals with 22 points and Scott added another 14.
Wiggs layup to start the second half gave Idaho a 10-point lead, 46-36, but the Wildcats rallied quickly, forging a 48-48 tie with 17:19 left in the game. From there, neither team could manage more than a four-point lead.
Richaud Gittens tied the game at 84-84 with :26 left with a pair of free throws.