Commons 2.4 fixes security issues with contributed modules included in Commons and many other enhancements. Please see the release notes for more information.
Commons 2.4 contains product enhancements and security updates. Users are strongly encouraged to apply this security update.
Note, to get the fully packaged version of Commons, download Commons from Acquia.com as the Drupal.org release contains only the Commons feature modules and does not contain Drupal core or contributed projects.