This is a minor bug-fix update. Updating is recommended for all 7.x-4.x branch users.
Upgrading from Webform 3.x to 4.0
If you're upgrading from Webform 3.x, please make a database backup prior to upgrading and check that all modules that extend Webform on your site are Webform 4.x compatible. Slight differences in the class names and IDs may result in updates being needed to your site's CSS. See the API changes between 3.x and 4.x documentation for more information.
This release of Webform 4.x fixes several issues discovered shortly after the release of 4.0-beta2 (which included a security update). Please read the release notes for 4.0-beta2 for a list of recent changes if upgrading from a previous beta or alpha version.
SA-CONTRIB-2014-018 - Webform - Cross Site Scripting (XSS)
This release of Webform 4.x fixes a large number of bugs and addresses an XSS security vulnerability. Beta2 introduces a new feature to preview submissions before submitting them in multipage forms. Upgrading is recommended for all users of Webform 4.x.