No it does not. The WRX rims are not designed to be used on such a heavy vehicle. It is a safety issue if you are using rims that cannot support the weight of the car. If the rims crack or bend when you are driving, it may also damage other component around it such as the brakes, suspension, or even the axle. There are plenty of wheels out there that are capable for the weight of Ascent.
If you are looking for 18" rims that fit the Ascent, you can check out at fast wheel and they have quite a few of them that can meet the requirement. I personally has a set of 20" Fast Wheel FC04 Titanium for my Abyss Blue Ascent.