Multiple critical security vulnerabilities were discovered in the Ninja Forms plugin for WordPress. If you are using a version less than 2.9.42, update immediately!
Ninja Forms is a very popular WordPress plugin to easily build forms for WordPress. The WordPress.org repository claims there are 500,000+ active installs andninjaforms.com claims there have been over 2.38 million downloads of the plugin as of May 4th 2016. The plugin is currently listed as the 35th most popular plugin in theWordPress.org repository.