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On April 20, 2015, WordPress 4.0.2 was released to the public. This is a security update for all previous WordPress versions.

Installation/Update Information

To download WordPress 4.0.2, update automatically from the Dashboard > Updates menu in your site's admin area or visit https://wordpress.org/download/release-archive/.

For step-by-step instructions on installing and updating WordPress:

• Updating WordPress

If you are new to WordPress, we recommend that you begin with the following:

• New To WordPress - Where to Start
• First Steps With WordPress or Upgrading WordPress Extended
• WordPress Lessons

Summary

From the announcement post:

• A serious critical cross-site scripting vulnerability, which could enable anonymous users to compromise a site.
• Files with invalid or unsafe names could be upload.
• Some plugins are vulnerable to an SQL injection attack.
• A very limited cross-site scripting vulnerability could be used as part of a social engineering attack.
• Four hardening changes, including better validation of post titles within the Dashboard.

List of Files Revised

license.txt
readme.html
wp-admin/includes/class-wp-comments-list-table.php
wp-admin/includes/dashboard.php
wp-admin/includes/post.php
wp-admin/includes/template.php
wp-admin/js/nav-menu.js
wp-includes/capabilities.php
wp-includes/class-wp-editor.php
wp-includes/formatting.php
wp-includes/js/plupload/plupload.flash.swf
wp-includes/version.php
wp-includes/wp-db.php