diff --git a/app/controllers/timelog_controller.rb b/app/controllers/timelog_controller.rb
index 509240be..30a8f70d 100644
--- a/app/controllers/timelog_controller.rb
+++ b/app/controllers/timelog_controller.rb
@@ -97,7 +97,7 @@ class TimelogController < ApplicationController
 
   def new
     @time_entry ||= TimeEntry.new(:project => @project, :issue => @issue, :user => User.current, :spent_on => User.current.today)
-    @time_entry.attributes = params[:time_entry]
+    @time_entry.safe_attributes = params[:time_entry]
 
     call_hook(:controller_timelog_edit_before_save, { :params => params, :time_entry => @time_entry })
     render :action => 'edit'
@@ -106,7 +106,7 @@ class TimelogController < ApplicationController
   verify :method => :post, :only => :create, :render => {:nothing => true, :status => :method_not_allowed }
   def create
     @time_entry ||= TimeEntry.new(:project => @project, :issue => @issue, :user => User.current, :spent_on => User.current.today)
-    @time_entry.attributes = params[:time_entry]
+    @time_entry.safe_attributes = params[:time_entry]
 
     call_hook(:controller_timelog_edit_before_save, { :params => params, :time_entry => @time_entry })
 
@@ -127,14 +127,14 @@ class TimelogController < ApplicationController
   end
 
   def edit
-    @time_entry.attributes = params[:time_entry]
+    @time_entry.safe_attributes = params[:time_entry]
 
     call_hook(:controller_timelog_edit_before_save, { :params => params, :time_entry => @time_entry })
   end
 
   verify :method => :put, :only => :update, :render => {:nothing => true, :status => :method_not_allowed }
   def update
-    @time_entry.attributes = params[:time_entry]
+    @time_entry.safe_attributes = params[:time_entry]
 
     call_hook(:controller_timelog_edit_before_save, { :params => params, :time_entry => @time_entry })
 
diff --git a/app/models/time_entry.rb b/app/models/time_entry.rb
index 2a23913a..901c0d4a 100644
--- a/app/models/time_entry.rb
+++ b/app/models/time_entry.rb
@@ -13,6 +13,7 @@
 #++
 
 class TimeEntry < ActiveRecord::Base
+  include Redmine::SafeAttributes
   # could have used polymorphic association
   # project association here allows easy loading of time entries at project level with one database trip
   belongs_to :project
@@ -37,6 +38,8 @@ class TimeEntry < ActiveRecord::Base
     :conditions => Project.allowed_to_condition(args.first || User.current, :view_time_entries)
   }}
 
+  safe_attributes 'hours', 'comments', 'issue_id', 'activity_id', 'spent_on', 'custom_field_values'
+
   def after_initialize
     if new_record? && self.activity.nil?
       if default_activity = TimeEntryActivity.default