[jadence]

Per pixeltrix's comment it appears that you're safe.

  "If you mean that your Ruby on Rails version is 1.2.6 then, no the vulnerability does not affect you as the feature was introduced in Ruby on Rails 2.0"

source: http://weblog.rubyonrails.org/2013/1/8/Rails-3-2-11-3-1-10-3...