These three releases contain important security fix, so please upgrade as soon as possible! In order to make upgrading as smooth as possible, we've only included commits directly related to each security issue.
more here......http://weblog.rubyonrails.org/2014/5/6/Rails_3_2_18_4_0_5_and_4_1_1_have_been_released/
more here......http://weblog.rubyonrails.org/2014/5/6/Rails_3_2_18_4_0_5_and_4_1_1_have_been_released/