Drupal versions 7.27 and Drupal 6.31 which now available for download, containing several fixes for security vulnerabilities.
Drupal is an open source platform maintained and developed by a community of 630,000+ users and developers. The nature of Drupal's open development model means that people are constantly working to make sure Drupal is a cutting-edge platform that supports the latest technologies that the Web has to offer.
The security releases introduce small API changes which may require code updates on sites that expose Ajax or multi-step forms to anonymous users, and where the forms are displayed on pages that are cached (either by Drupal or by an external system).
Although there are no new features or non-security-related bug fixes in these releases, Drupal "strongly recommend" that users of both Drupal 7 and Drupal 6 download these security updates.
To dig into the details of each security upgrade, you can check out the Drupal 7.27 release notes and the Drupal 6.31 release notes.
For maximum security, you can upgrade your Drupal version right here.
Also, be sure to explore more of Drupal via our CMS Directory.