Cross-site scripting (XSS) vulnerability in actionpack/lib/action_view/helpers/form_tag_helper.rb in Ruby on Rails 3.x before 3.0.17, 3.1.x before 3.1.8, and 3.2.x before 3.2.8 allows remote attackers to inject arbitrary web script or HTML via the prompt field to the select_tag helper.
https://groups.google.com/group/rubyonrails-security/msg/961e18e514527078?dmode=source&output=gplain
http://weblog.rubyonrails.org/2012/8/9/ann-rails-3-2-8-has-been-released/