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On May 6, 2015, WordPress 3.9.6 was released to the public, along with WordPress 4.2.2. This is both a security update for all previous WordPress versions, and a maintenance release for versions 4.1 and newer.
To download WordPress 3.9.6, 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:
From the announcement post, WordPress 3.9.6 fixes a cross-site scripting vulnerability contained in an HTML file shipped with recent Genericons packages included in the Twenty Fifteen theme as well as a number of popular plugins by removing the file. Auto-updates and manual updates will remove this file, however manual installations and those using VCS checkout (like SVN) will not remove this file. Version 3.9.6 also improves on a fix for a critical cross-site scripting vulnerability introduced in 3.9.5.
The release also includes hardening for a potential cross-site scripting vulnerability when using the Visual editor.
WordPress 3.9.6 also contains fixes for 3 bugs from 3.9.5, including:
wp-admin/about.php wp-admin/includes/upgrade.php wp-admin/includes/update-core.php wp-includes/wp-db.php wp-includes/version.php wp-includes/compat.php wp-includes/js/tinymce/plugins/wordpress/plugin.js readme.html