Are these some kind of wild rose? I've had ornamental previously, and they seem similar. We just bought a new piece of land... after I had finally nailed down everything I used to own. This land has been feral for several years. Who knows what I will find!
To plant a garden is to believe in tomorrow. - Audrey Hepburn
Name: John Scott County, KY (Zone 5b) You can't have too many viburnums..
I'll agree that your plant is wild (feral) and a rose of some sort (Rosa sp.).
Biggest suspect in a feral locale is going to be the non-native exotic noxious Multiflora Rose (Rosa multiflora). I can't tell from only the closeups provided whether that is exactly what you have.
Looked up the multiflora rose, and that is a pretty solid match. It is hedging, has thorny canes, and fringed stipules. Now it seems I will be going at it with my nata before it gets any more of my forest edge.
To plant a garden is to believe in tomorrow. - Audrey Hepburn
Name: John Scott County, KY (Zone 5b) You can't have too many viburnums..
At least cut it off before it sets fruit; that way, you won't have ten thousand more seedlings from each plant next year. Birds are good at distributing this one freely.