On Dec. 12, 2018, WordPress 4.9.9 was released to the public.
To download WordPress 4.9.9, 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 WordPress 5.0.1 release post, WordPress versions 5.0 and earlier are affected by the bugs described in the post.
/wp-admin/includes/ajax-actions.php /wp-admin/includes/class-wp-screen.php /wp-admin/includes/post.php /wp-admin/about.php /wp-admin/post.php /wp-includes/class-wp.php /wp-includes/functions.php /wp-includes/general-template.php /wp-includes/kses.php /wp-includes/ms-deprecated.php /wp-includes/version.php /wp-activate.php /wp-login.php