On September 15, 2015, WordPress 3.9.9 was released to the public. This is a security update for all previous WordPress versions.
To download WordPress 3.9.9, 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:
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
From the announcement post, WordPress 3.9.9 fixes two cross-site scripting vulnerabilities (CVE-2015-5714, CVE-2015-5715) and a potential privilege escalation.
List of Files Revised
readme.html wp-admin/about.php wp-admin/includes/ajax-actions.php wp-admin/includes/class-wp-ms-users-list-table.php wp-admin/includes/class-wp-users-list-table.php wp-includes/class-wp-xmlrpc-server.php wp-includes/media.php wp-includes/shortcodes.php wp-includes/version.php wp-includes/wp-db.php