diff --git a/AUTHORS b/AUTHORS
index 7d5d9ada..f52ce9ad 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -28,3 +28,4 @@ Joel Stevenson
 Brendan McCollam
 Jonathan Huot
 Pieter Ennes
+Olaf Conradi
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 7389af0f..d7bb76e9 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,14 @@
 Changelog
 =========
 
+2.0.8 (2018-05-18)
+------------------
+
+* Fixed some copy and paste typos (#535)
+* Use secrets module in Python 3.6 and later (#533)
+* Add request argument to confirm_redirect_uri (#504)
+* Avoid populating spurious token credentials (#542, #546)
+
 2.0.7 (2018-03-19)
 ------------------
 
diff --git a/docs/oauth1/security.rst b/docs/oauth1/security.rst
index a1432a92..df1e2a0e 100644
--- a/docs/oauth1/security.rst
+++ b/docs/oauth1/security.rst
@@ -16,11 +16,13 @@ A few important facts regarding OAuth security
 
     * **Tokens must be random**, OAuthLib provides a method for generating
         secure tokens and it's packed into ``oauthlib.common.generate_token``,
-        use it. If you decide to roll your own, use ``random.SystemRandom``
-        which is based on ``os.urandom`` rather than the default ``random``
-        based on the effecient but not truly random Mersenne Twister.
-        Predictable tokens allow attackers to bypass virtually all defences
-        OAuth provides.
+        use it. If you decide to roll your own, use ``secrets.SystemRandom``
+        for Python 3.6 and later. The ``secrets`` module is designed for
+        generating cryptographically strong random numbers. For earlier versions
+        of Python, use ``random.SystemRandom`` which is based on ``os.urandom``
+        rather than the default ``random`` based on the effecient but not truly
+        random Mersenne Twister. Predictable tokens allow attackers to bypass
+        virtually all defences OAuth provides.
 
     * **Timing attacks are real** and more than possible if you host your
         application inside a shared datacenter. Ensure all ``validate_`` methods
diff --git a/examples/skeleton_oauth2_web_application_server.py b/examples/skeleton_oauth2_web_application_server.py
index 8bfd9369..e53232f3 100644
--- a/examples/skeleton_oauth2_web_application_server.py
+++ b/examples/skeleton_oauth2_web_application_server.py
@@ -67,7 +67,7 @@ def validate_code(self, client_id, code, client, request, *args, **kwargs):
         # state and user to request.scopes and request.user.
         pass
 
-    def confirm_redirect_uri(self, client_id, code, redirect_uri, client, *args, **kwargs):
+    def confirm_redirect_uri(self, client_id, code, redirect_uri, client, request, *args, **kwargs):
         # You did save the redirect uri with the authorization code right?
         pass
 
diff --git a/oauthlib/__init__.py b/oauthlib/__init__.py
index 36450108..039efb89 100644
--- a/oauthlib/__init__.py
+++ b/oauthlib/__init__.py
@@ -10,7 +10,7 @@
 """
 
 __author__ = 'The OAuthlib Community'
-__version__ = '2.0.7'
+__version__ = '2.0.8'
 
 
 import logging
diff --git a/oauthlib/common.py b/oauthlib/common.py
index afcc09ca..f25656ff 100644
--- a/oauthlib/common.py
+++ b/oauthlib/common.py
@@ -11,11 +11,16 @@
 import collections
 import datetime
 import logging
-import random
 import re
 import sys
 import time
 
+try:
+    from secrets import randbits
+    from secrets import SystemRandom
+except ImportError:
+    from random import getrandbits as randbits
+    from random import SystemRandom
 try:
     from urllib import quote as _quote
     from urllib import unquote as _unquote
@@ -202,7 +207,7 @@ def generate_nonce():
     .. _`section 3.2.1`: https://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01#section-3.2.1
     .. _`section 3.3`: https://tools.ietf.org/html/rfc5849#section-3.3
     """
-    return unicode_type(unicode_type(random.getrandbits(64)) + generate_timestamp())
+    return unicode_type(unicode_type(randbits(64)) + generate_timestamp())
 
 
 def generate_timestamp():
@@ -225,7 +230,7 @@ def generate_token(length=30, chars=UNICODE_ASCII_CHARACTER_SET):
     and entropy when generating the random characters is important. Which is
     why SystemRandom is used instead of the default random.choice method.
     """
-    rand = random.SystemRandom()
+    rand = SystemRandom()
     return ''.join(rand.choice(chars) for x in range(length))
 
 
diff --git a/oauthlib/oauth2/rfc6749/clients/base.py b/oauthlib/oauth2/rfc6749/clients/base.py
index a07a5c99..07ef8949 100644
--- a/oauthlib/oauth2/rfc6749/clients/base.py
+++ b/oauthlib/oauth2/rfc6749/clients/base.py
@@ -9,6 +9,7 @@
 from __future__ import absolute_import, unicode_literals
 
 import time
+import warnings
 
 from oauthlib.common import generate_token
 from oauthlib.oauth2.rfc6749 import tokens
@@ -111,8 +112,10 @@ def __init__(self, client_id,
         self.state_generator = state_generator
         self.state = state
         self.redirect_url = redirect_url
+        self.code = None
+        self.expires_in = None
         self._expires_at = None
-        self._populate_attributes(self.token)
+        self.populate_token_attributes(self.token)
 
     @property
     def token_types(self):
@@ -406,7 +409,7 @@ def parse_request_body_response(self, body, scope=None, **kwargs):
         .. _`Section 7.1`: https://tools.ietf.org/html/rfc6749#section-7.1
         """
         self.token = parse_token_response(body, scope=scope)
-        self._populate_attributes(self.token)
+        self.populate_token_attributes(self.token)
         return self.token
 
     def prepare_refresh_body(self, body='', refresh_token=None, scope=None, **kwargs):
@@ -460,7 +463,18 @@ def _add_mac_token(self, uri, http_method='GET', body=None,
         return uri, headers, body
 
     def _populate_attributes(self, response):
-        """Add commonly used values such as access_token to self."""
+        warnings.warn("Please switch to the public method "
+                      "populate_token_attributes.", DeprecationWarning)
+        return self.populate_token_attributes(response)
+
+    def populate_code_attributes(self, response):
+        """Add attributes from an auth code response to self."""
+
+        if 'code' in response:
+            self.code = response.get('code')
+
+    def populate_token_attributes(self, response):
+        """Add attributes from a token exchange response to self."""
 
         if 'access_token' in response:
             self.access_token = response.get('access_token')
@@ -478,9 +492,6 @@ def _populate_attributes(self, response):
         if 'expires_at' in response:
             self._expires_at = int(response.get('expires_at'))
 
-        if 'code' in response:
-            self.code = response.get('code')
-
         if 'mac_key' in response:
             self.mac_key = response.get('mac_key')
 
diff --git a/oauthlib/oauth2/rfc6749/clients/mobile_application.py b/oauthlib/oauth2/rfc6749/clients/mobile_application.py
index 311aacf8..aa20daab 100644
--- a/oauthlib/oauth2/rfc6749/clients/mobile_application.py
+++ b/oauthlib/oauth2/rfc6749/clients/mobile_application.py
@@ -168,5 +168,5 @@ def parse_request_uri_response(self, uri, state=None, scope=None):
         .. _`Section 3.3`: https://tools.ietf.org/html/rfc6749#section-3.3
         """
         self.token = parse_implicit_response(uri, state=state, scope=scope)
-        self._populate_attributes(self.token)
+        self.populate_token_attributes(self.token)
         return self.token
diff --git a/oauthlib/oauth2/rfc6749/clients/service_application.py b/oauthlib/oauth2/rfc6749/clients/service_application.py
index 84ea0e99..7f336bbc 100644
--- a/oauthlib/oauth2/rfc6749/clients/service_application.py
+++ b/oauthlib/oauth2/rfc6749/clients/service_application.py
@@ -146,8 +146,8 @@ def prepare_request_body(self,
                              ' token requests.')
         claim = {
             'iss': issuer or self.issuer,
-            'aud': audience or self.issuer,
-            'sub': subject or self.issuer,
+            'aud': audience or self.audience,
+            'sub': subject or self.subject,
             'exp': int(expires_at or time.time() + 3600),
             'iat': int(issued_at or time.time()),
         }
diff --git a/oauthlib/oauth2/rfc6749/clients/web_application.py b/oauthlib/oauth2/rfc6749/clients/web_application.py
index 0dd5f6ef..25280bf8 100644
--- a/oauthlib/oauth2/rfc6749/clients/web_application.py
+++ b/oauthlib/oauth2/rfc6749/clients/web_application.py
@@ -172,5 +172,5 @@ def parse_request_uri_response(self, uri, state=None):
             oauthlib.oauth2.rfc6749.errors.MismatchingStateError
         """
         response = parse_authorization_code_response(uri, state=state)
-        self._populate_attributes(response)
+        self.populate_code_attributes(response)
         return response
diff --git a/oauthlib/oauth2/rfc6749/grant_types/authorization_code.py b/oauthlib/oauth2/rfc6749/grant_types/authorization_code.py
index 7bea6507..06602634 100644
--- a/oauthlib/oauth2/rfc6749/grant_types/authorization_code.py
+++ b/oauthlib/oauth2/rfc6749/grant_types/authorization_code.py
@@ -421,7 +421,8 @@ def validate_token_request(self, request):
         # authorization request as described in Section 4.1.1, and their
         # values MUST be identical.
         if not self.request_validator.confirm_redirect_uri(request.client_id, request.code,
-                                                           request.redirect_uri, request.client):
+                                                           request.redirect_uri, request.client,
+                                                           request):
             log.debug('Redirect_uri (%r) invalid for client %r (%r).',
                       request.redirect_uri, request.client_id, request.client)
             raise errors.MismatchingRedirectURIError(request=request)
diff --git a/oauthlib/oauth2/rfc6749/request_validator.py b/oauthlib/oauth2/rfc6749/request_validator.py
index 26b0041c..fee7b8cb 100644
--- a/oauthlib/oauth2/rfc6749/request_validator.py
+++ b/oauthlib/oauth2/rfc6749/request_validator.py
@@ -82,7 +82,7 @@ def authenticate_client_id(self, client_id, request, *args, **kwargs):
         """
         raise NotImplementedError('Subclasses must implement this method.')
 
-    def confirm_redirect_uri(self, client_id, code, redirect_uri, client,
+    def confirm_redirect_uri(self, client_id, code, redirect_uri, client, request,
                              *args, **kwargs):
         """Ensure that the authorization process represented by this authorization
         code began with this 'redirect_uri'.
diff --git a/tests/oauth2/rfc6749/clients/test_mobile_application.py b/tests/oauth2/rfc6749/clients/test_mobile_application.py
index 309220ba..51e4dab3 100644
--- a/tests/oauth2/rfc6749/clients/test_mobile_application.py
+++ b/tests/oauth2/rfc6749/clients/test_mobile_application.py
@@ -69,6 +69,18 @@ def test_implicit_token_uri(self):
         uri = client.prepare_request_uri(self.uri, **self.kwargs)
         self.assertURLEqual(uri, self.uri_kwargs)
 
+    def test_populate_attributes(self):
+
+        client = MobileApplicationClient(self.client_id)
+
+        response_uri = (self.response_uri + "&code=EVIL-CODE")
+
+        client.parse_request_uri_response(response_uri, scope=self.scope)
+
+        # We must not accidentally pick up any further security
+        # credentials at this point.
+        self.assertIsNone(client.code)
+
     def test_parse_token_response(self):
         client = MobileApplicationClient(self.client_id)
 
diff --git a/tests/oauth2/rfc6749/clients/test_web_application.py b/tests/oauth2/rfc6749/clients/test_web_application.py
index 85b247d1..fa6643eb 100644
--- a/tests/oauth2/rfc6749/clients/test_web_application.py
+++ b/tests/oauth2/rfc6749/clients/test_web_application.py
@@ -117,6 +117,25 @@ def test_parse_grant_uri_response(self):
                 self.response_uri,
                 state="invalid")
 
+    def test_populate_attributes(self):
+
+        client = WebApplicationClient(self.client_id)
+
+        response_uri = (self.response_uri +
+                        "&access_token=EVIL-TOKEN"
+                        "&refresh_token=EVIL-TOKEN"
+                        "&mac_key=EVIL-KEY")
+
+        client.parse_request_uri_response(response_uri, self.state)
+
+        self.assertEqual(client.code, self.code)
+
+        # We must not accidentally pick up any further security
+        # credentials at this point.
+        self.assertIsNone(client.access_token)
+        self.assertIsNone(client.refresh_token)
+        self.assertIsNone(client.mac_key)
+
     def test_parse_token_response(self):
         client = WebApplicationClient(self.client_id)