I’ve never seen a “confirm cancel” box that seemed to have the right sort of copy. Here’s one from Google that feels like they missed the mark:

A HTML pop-up with the title 'Confirm cancel' and the copy 'Do you want to cancel adding this app and lose the progress that you've made? To cancel, click confirm.' and two buttons: the left one with the copy 'Back' and the right one with the copy 'Confirm'

I wonder if it’s better to avoid arbitrary verbs, and use copy involving Yes or No:

A sample HTML pop-up with the title 'Cancel operation' and the copy 'Are you sure you want to cancel this operation? You will loose your work.' and two buttons: the left one with the copy 'No, go back' and the right one with the copy 'Yes, Cancel'