diff --git a/djangorestframework/authentication.py b/djangorestframework/authentication.py
index b61af32a2..ea030c06b 100644
--- a/djangorestframework/authentication.py
+++ b/djangorestframework/authentication.py
@@ -95,11 +95,16 @@ class UserLoggedInAuthentication(BaseAuthentication):
             # Temporarily replace request.POST with .DATA, to use our generic parsing.
             # If DATA is not dict-like, use an empty dict.
             if request.method.upper() == 'POST':
+                token = request.POST.get('csrfmiddlewaretoken')
+
                 if hasattr(self.view.DATA, 'get'):
-                    request._post = self.view.DATA
+                    request._post = self.view.DATA.copy()
                 else:
                     request._post = {}
 
+                if token is not None:
+                    request._post['csrfmiddlewaretoken'] = token
+
             resp = CsrfViewMiddleware().process_view(request, None, (), {})
 
             # Replace request.POST