Used 2022 GT with accident

This is my first time buying a car. Guy selling with rear side accident. No carfax report. How serious is this? Selling for $22k with over 22k miles.

Thank you all. Thanks!

This is my first time buying a car. Guy selling with rear side accident. No carfax report. How serious is this? Selling for $22k with over 22k miles.

Thank you all. Thanks!