diff --git a/rhodecode/api/views/user_group_api.py b/rhodecode/api/views/user_group_api.py
--- a/rhodecode/api/views/user_group_api.py
+++ b/rhodecode/api/views/user_group_api.py
@@ -638,8 +638,18 @@ def grant_user_permission_to_user_group(
     perm = get_perm_or_error(perm, prefix='usergroup.')
 
     try:
-        UserGroupModel().grant_user_permission(
+        changes = UserGroupModel().grant_user_permission(
             user_group=user_group, user=user, perm=perm)
+
+        action_data = {
+            'added': changes['added'],
+            'updated': changes['updated'],
+            'deleted': changes['deleted'],
+        }
+        audit_logger.store_api(
+            'user_group.edit.permissions', action_data=action_data,
+            user=apiuser)
+
         Session().commit()
         return {
             'msg':
@@ -698,8 +708,17 @@ def revoke_user_permission_from_user_gro
     user = get_user_or_error(userid)
 
     try:
-        UserGroupModel().revoke_user_permission(
+        changes = UserGroupModel().revoke_user_permission(
             user_group=user_group, user=user)
+        action_data = {
+            'added': changes['added'],
+            'updated': changes['updated'],
+            'deleted': changes['deleted'],
+        }
+        audit_logger.store_api(
+            'user_group.edit.permissions', action_data=action_data,
+            user=apiuser)
+
         Session().commit()
         return {
             'msg': 'Revoked perm for user: `%s` in user group: `%s`' % (
@@ -764,11 +783,20 @@ def grant_user_group_permission_to_user_
                 'user group `%s` does not exist' % (sourceusergroupid,))
 
     try:
-        UserGroupModel().grant_user_group_permission(
+        changes = UserGroupModel().grant_user_group_permission(
             target_user_group=target_user_group,
             user_group=user_group, perm=perm)
+
+        action_data = {
+            'added': changes['added'],
+            'updated': changes['updated'],
+            'deleted': changes['deleted'],
+        }
+        audit_logger.store_api(
+            'user_group.edit.permissions', action_data=action_data,
+            user=apiuser)
+
         Session().commit()
-
         return {
             'msg': 'Granted perm: `%s` for user group: `%s` '
                    'in user group: `%s`' % (
@@ -835,8 +863,17 @@ def revoke_user_group_permission_from_us
                 'user group `%s` does not exist' % (sourceusergroupid,))
 
     try:
-        UserGroupModel().revoke_user_group_permission(
+        changes = UserGroupModel().revoke_user_group_permission(
             target_user_group=target_user_group, user_group=user_group)
+        action_data = {
+            'added': changes['added'],
+            'updated': changes['updated'],
+            'deleted': changes['deleted'],
+        }
+        audit_logger.store_api(
+            'user_group.edit.permissions', action_data=action_data,
+            user=apiuser)
+
         Session().commit()
 
         return {
diff --git a/rhodecode/model/user_group.py b/rhodecode/model/user_group.py
--- a/rhodecode/model/user_group.py
+++ b/rhodecode/model/user_group.py
@@ -80,6 +80,7 @@ class UserGroupModel(BaseModel):
             'updated': [],
             'deleted': []
         }
+        change_obj = user_group.get_api_data()
         # update permissions
         for member_id, perm, member_type in perm_updates:
             member_id = int(member_id)
@@ -97,8 +98,10 @@ class UserGroupModel(BaseModel):
                     self.grant_user_group_permission(
                         target_user_group=user_group, user_group=member_id, perm=perm)
 
-            changes['updated'].append({'type': member_type, 'id': member_id,
-                                       'name': member_name, 'new_perm': perm})
+            changes['updated'].append({
+                'change_obj': change_obj,
+                'type': member_type, 'id': member_id,
+                'name': member_name, 'new_perm': perm})
 
         # set new permissions
         for member_id, perm, member_type in perm_additions:
@@ -115,8 +118,10 @@ class UserGroupModel(BaseModel):
                     self.grant_user_group_permission(
                         target_user_group=user_group, user_group=member_id, perm=perm)
 
-            changes['added'].append({'type': member_type, 'id': member_id,
-                                     'name': member_name, 'new_perm': perm})
+            changes['added'].append({
+                'change_obj': change_obj,
+                'type': member_type, 'id': member_id,
+                'name': member_name, 'new_perm': perm})
 
         # delete permissions
         for member_id, perm, member_type in perm_deletions:
@@ -132,8 +137,11 @@ class UserGroupModel(BaseModel):
                     self.revoke_user_group_permission(
                         target_user_group=user_group, user_group=member_id)
 
-            changes['deleted'].append({'type': member_type, 'id': member_id,
-                                       'name': member_name, 'new_perm': perm})
+            changes['deleted'].append({
+                'change_obj': change_obj,
+                'type': member_type, 'id': member_id,
+                'name': member_name, 'new_perm': perm})
+
         return changes
 
     def get(self, user_group_id, cache=False):
@@ -400,10 +408,18 @@ class UserGroupModel(BaseModel):
         :param user: Instance of User, user_id or username
         :param perm: Instance of Permission, or permission_name
         """
+        changes = {
+            'added': [],
+            'updated': [],
+            'deleted': []
+        }
 
         user_group = self._get_user_group(user_group)
         user = self._get_user(user)
         permission = self._get_perm(perm)
+        perm_name = permission.permission_name
+        member_id = user.user_id
+        member_name = user.username
 
         # check if we have that permission already
         obj = self.sa.query(UserUserGroupToPerm)\
@@ -422,7 +438,12 @@ class UserGroupModel(BaseModel):
             'granted permission: {} to user: {} on usergroup: {}'.format(
                 perm, user, user_group), namespace='security.usergroup')
 
-        return obj
+        changes['added'].append({
+            'change_obj': user_group.get_api_data(),
+            'type': 'user', 'id': member_id,
+            'name': member_name, 'new_perm': perm_name})
+
+        return changes
 
     def revoke_user_permission(self, user_group, user):
         """
@@ -432,9 +453,17 @@ class UserGroupModel(BaseModel):
             or users_group name
         :param user: Instance of User, user_id or username
         """
+        changes = {
+            'added': [],
+            'updated': [],
+            'deleted': []
+        }
 
         user_group = self._get_user_group(user_group)
         user = self._get_user(user)
+        perm_name = 'usergroup.none'
+        member_id = user.user_id
+        member_name = user.username
 
         obj = self.sa.query(UserUserGroupToPerm)\
             .filter(UserUserGroupToPerm.user == user)\
@@ -447,6 +476,13 @@ class UserGroupModel(BaseModel):
                 'revoked permission from user: {} on usergroup: {}'.format(
                     user, user_group), namespace='security.usergroup')
 
+            changes['deleted'].append({
+                'change_obj': user_group.get_api_data(),
+                'type': 'user', 'id': member_id,
+                'name': member_name, 'new_perm': perm_name})
+
+        return changes
+
     def grant_user_group_permission(self, target_user_group, user_group, perm):
         """
         Grant user group permission for given target_user_group
@@ -455,9 +491,19 @@ class UserGroupModel(BaseModel):
         :param user_group:
         :param perm:
         """
+        changes = {
+            'added': [],
+            'updated': [],
+            'deleted': []
+        }
+
         target_user_group = self._get_user_group(target_user_group)
         user_group = self._get_user_group(user_group)
         permission = self._get_perm(perm)
+        perm_name = permission.permission_name
+        member_id = user_group.users_group_id
+        member_name = user_group.users_group_name
+
         # forbid assigning same user group to itself
         if target_user_group == user_group:
             raise RepoGroupAssignmentError('target repo:%s cannot be '
@@ -482,7 +528,12 @@ class UserGroupModel(BaseModel):
                 perm, user_group, target_user_group),
             namespace='security.usergroup')
 
-        return obj
+        changes['added'].append({
+            'change_obj': target_user_group.get_api_data(),
+            'type': 'user_group', 'id': member_id,
+            'name': member_name, 'new_perm': perm_name})
+
+        return changes
 
     def revoke_user_group_permission(self, target_user_group, user_group):
         """
@@ -491,8 +542,17 @@ class UserGroupModel(BaseModel):
         :param target_user_group:
         :param user_group:
         """
+        changes = {
+            'added': [],
+            'updated': [],
+            'deleted': []
+        }
+
         target_user_group = self._get_user_group(target_user_group)
         user_group = self._get_user_group(user_group)
+        perm_name = 'usergroup.none'
+        member_id = user_group.users_group_id
+        member_name = user_group.users_group_name
 
         obj = self.sa.query(UserGroupUserGroupToPerm)\
             .filter(UserGroupUserGroupToPerm.target_user_group == target_user_group)\
@@ -507,6 +567,13 @@ class UserGroupModel(BaseModel):
                     user_group, target_user_group),
                 namespace='security.repogroup')
 
+            changes['deleted'].append({
+                'change_obj': target_user_group.get_api_data(),
+                'type': 'user_group', 'id': member_id,
+                'name': member_name, 'new_perm': perm_name})
+
+        return changes
+
     def get_perms_summary(self, user_group_id):
         permissions = {
             'repositories': {},