If you don’t have the trapfinding class ability, this spell grants you the trapfinding ability of a rogue of half your character level.
This doesn't seem dependent on the creator of the scroll; the duration (1 min / level) obviously is, as would attempts to dispel the buff, but otherwise would a 10th level barbarian who pulls off the UMD check to use it have the equivalent of a 5th level rogue in trapfinding?