WordPress has issued a new security update for WordPress 2.2 and the legacy WordPress 2.0.
Details and links to the downloads can be found at the WordPress development blog. As this new update features mainly security updates or small bug fixes it shouldn’t interfere with any of your plugins or themes, although it’s still a good idea to take a backup of all your files before you install this update, in case anything goes wrong.
If you have a WordPress blog it’s highly recommended that you update your blog asap, otherwise you may be making it a lot easier for hackers to seriously mess up your blog. A list of all the updates can be found here, as you can see one of the bugs they fixed is a XSS exploit which allows malicious visitors to execute remote commands on your blog.