Ruby on Rails 2.3.9 and 3.0.0 does not properly handle nested attributes, which allows remote attackers to modify arbitrary records by changing the names of parameters for form inputs.
https://github.com/advisories/GHSA-gjxw-5w2q-7grf
https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-0240
http://www.vupen.com/english/advisories/2010/2719