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On November 20, 2014, WordPress 4.0.1 was released to the public and WordPress 3.8.5 was released as an automatic security update for WordPress 3.8.4.

Installation/Update Information

To download WordPress 3.8.5, 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:

• Three cross-site scripting issues that a contributor or author could use to compromise a site.
• A cross-site request forgery that could be used to trick a user into changing their password.
• An issue that could lead to a denial of service when passwords are checked.
• Additional protections for server-side request forgery attacks when WordPress makes HTTP requests.
• An extremely unlikely hash collision could allow a user’s account to be compromised, that also required that they haven’t logged in since 2008 (I wish I were kidding).
• WordPress now invalidates the links in a password reset email if the user remembers their password, logs in, and changes their email address.

List of Files Revised

readme.html
wp-admin/about.php
wp-admin/includes/image.php
wp-admin/press-this.php
wp-includes/class-phpass.php
wp-includes/formatting.php
wp-includes/http.php
wp-includes/kses.php
wp-includes/pluggable.php
wp-includes/user.php
wp-includes/version.php
wp-login.php