CVE-2014-0081: XSS Vulnerability in number_to_currency, number_to_percentage and number_to_human

There is an XSS vulnerability in the number_to_currency, number_to_percentage and number_to_human helpers in Ruby on Rails. These helpers allow users to nicely format a numeric value. Some helper parameters (format, negative_format and units) are not escaped correctly. Applications which pass user controlled data as one of these parameters are vulnerable to an XSS attack. All users passing user controlled data to these parameters of the number helpers should either upgrade or use one of the workarounds immediately.