WordPress 3.4.2 has just been released and is now available for download. This update is a maintenance and security release for all previous versions.
After nearly 15 million downloads since 3.4 was released not three months ago, we’ve identified and fixed a number of nagging bugs, including:
■Fix some issues with older browsers in the administration area.
■Fix an issue where a theme may not preview correctly, or its screenshot may not be displayed.
■Address pagination problems with some category permalink structures.
■Improve plugin compatibility with the visual editor.
■Prevent improperly sized header images from being uploaded.
■Avoid errors with both oEmbed providers and trackbacks.
This version also fixes a few security issues and contains some security hardening. The vulnerabilities included potential privilege escalation and a bug that affects multisite installs with untrusted users. These issues were discovered and fixed by the WordPress security team.
Download 3.4.2 now or visit your Dashboard → Updates in your site admin to update now.