WordPress.org

On 29 November, 2017, WordPress 3.9.22 was released to the public.

Installation/Update Information

To download WordPress 3.9.22, 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 4.9.1 release post: WordPress versions 4.9 and earlier are affected by four security issues which could potentially be exploited as part of a multi-vector attack. As part of the core team's ongoing commitment to security hardening, the following fixes have been implemented in 4.9.1:

1. Use a properly generated hash for the newbloguser key instead of a determinate substring.
2. Add escaping to the language attributes used on html elements.
3. Ensure the attributes of enclosures are correctly escaped in RSS and Atom feeds.
4. Remove the ability to upload JavaScript files for users who do not have the unfiltered_html capability.

List of Files Revised

wp-admin/about.php
wp-admin/user-new.php
wp-includes/feed.php
wp-includes/functions.php
wp-includes/general-template.php
wp-includes/version.php
wp-includes/wp-db.php