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On 16 January, 2018, WordPress 4.8.5 was released to the public.

Installation/Update Information

To download WordPress 4.8.5, 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 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/about.php
wp-admin/includes/update-core.php
wp-includes/js/mediaelement/flashmediaelement.swf
wp-includes/js/mediaelement/silverlightmediaelement.xap
wp-includes/version.php