Installation/Update Information
To download WordPress 4.3.1, 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, WordPress 4.3.1 fixes two cross-site scripting vulnerabilities (CVE-2015-5714, CVE-2015-5715) and a potential privilege escalation.
In addition to the security fixes, WordPress 4.3.1 contains fixes for 26 bugs from 4.3, including:
List of Files Revised
readme.html
wp-admin/about.php
wp-admin/css/forms-rtl.css
wp-admin/css/forms.css
wp-admin/css/list-tables-rtl.css
wp-admin/css/list-tables.css
wp-admin/css/login-rtl.min.css
wp-admin/css/login.min.css
wp-admin/css/wp-admin-rtl.min.css
wp-admin/css/wp-admin.min.css
wp-admin/includes/class-wp-filesystem-ssh2.php
wp-admin/includes/class-wp-ms-users-list-table.php
wp-admin/includes/class-wp-users-list-table.php
wp-admin/includes/template.php
wp-admin/includes/upgrade.php
wp-admin/includes/user.php
wp-admin/includes/version.php
wp-admin/js/customize-controls.js
wp-admin/js/customize-controls.min.js
wp-admin/js/customize-nav-menus.js
wp-admin/js/customize-nav-menus.min.js
wp-admin/js/edit-comments.js
wp-admin/js/edit-comments.min.js
wp-admin/js/user-profile.js
wp-admin/js/user-profile.min.js
wp-admin/network/site-new.php
wp-admin/network/site-users.php
wp-admin/network/user-new.php
wp-admin/network/users.php
wp-includes/category-template.php
wp-includes/class-wp-xmlrpc-server.php
wp-includes/default-widgets.php
wp-includes/formatting.php
wp-includes/js/tinymce/plugins/charmap/plugin.js
wp-includes/js/tinymce/plugins/charmap/plugin.min.js
wp-includes/js/tinymce/plugins/lists/plugin.js
wp-includes/js/tinymce/plugins/media/plugin.js
wp-includes/js/tinymce/plugins/media/plugin.min.js
wp-includes/js/tinymce/plugins/paste/plugin.js
wp-includes/js/tinymce/plugins/paste/plugin.min.js
wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
wp-includes/js/tinymce/plugins/wpeditimage/plugin.min.js
wp-includes/js/tinymce/plugins/wplink/plugin.js
wp-includes/js/tinymce/plugins/wplink/plugin.min.js
wp-includes/js/tinymce/plugins/wpview/plugin.js
wp-includes/js/tinymce/plugins/wpview/plugin.min.js
wp-includes/js/tinymce/skins/lightgray/content.inline.min.css
wp-includes/js/tinymce/skins/lightgray/content.min.css
wp-includes/js/tinymce/skins/lightgray/skin.ie7.min.css
wp-includes/js/tinymce/skins/lightgray/skin.min.css
wp-includes/js/tinymce/themes/modern/theme.js
wp-includes/js/tinymce/themes/modern/theme.min.js
wp-includes/js/tinymce/tinymce.min.js
wp-includes/js/tinymce/wp-tinymce.js.gz
wp-includes/js/wp-ajax-response.js
wp-includes/js/wp-ajax-response.min.js
wp-includes/media.php
wp-includes/pluggable.php
wp-includes/shortcodes.php
wp-includes/taxonomy.php
wp-includes/user.php
wp-includes/version.php
wp-includes/widgets.php
wp-includes/wp-db.php
