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On 16 January, 2018, WordPress 3.9.23 was released to the public.

Installation/Update Information

To download WordPress 3.9.23, 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 WordPress 4.9.2 release post: WordPress versions 4.9 and earlier are affected by an XSS vulnerability in the Flash fallback files in MediaElement 4.x. The following fixes have been implemented in this release:

1. Upgrade: When deleting old files, if deletion fails attempt to empty the file instead. (#42963)
2. External Libraries: Remove unnecessary / obsoleted MediaElement.js files. (#42720)

List of Files Revised

wp-admin/includes/update-core.php
wp-admin/about.php
wp-includes/version.php
wp-includes/js/mediaelement/flashmediaelement.swf
wp-includes/js/mediaelement/silverlightmediaelement.xap