activerecord/lib/active_record/relation/query_methods.rb in Active Record in Ruby on Rails 4.0.x before 4.0.9 and 4.1.x before 4.1.5 allows remote attackers to bypass the strong parameters protection mechanism via crafted input to an application that makes create_with calls.
https://github.com/advisories/GHSA-hm48-76wh-q86v
https://github.com/advisories/GHSA-9rf5-jm6f-2fmm
https://groups.google.com/forum/message/raw?msg=rubyonrails-security/M4chq5Sb540/CC1Fh0Y_NWwJ
https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-0209
http://secunia.com/advisories/60347