Ryan Boren announced today that WordPress 3.1.1 is now available for all to go and update their sites. There were nearly 30 fixes that went into the Maintenance and Security release, which included some performance improvements, fixes for taxonomy and PATHINFO permalinks, and more. So what are you waiting for?
If you never updated to 3.1, then now is the perfect time to make the switch to 3.1.1.
Boren explains the security side of the release on the WordPress.org blog:
Version 3.1.1 also addresses three security issues discovered by WordPress core developers Jon Cave and Peter Westwood, of our security team. The first hardens CSRF prevention in the media uploader. The second avoids a PHP crash in certain environments when handling devilishly devised links in comments, and the third addresses an XSS flaw.
The release comes 6 weeks after 3.1 was first released.