WordPress.org have just announced that an unknown person gained user level access to one of their servers and inserted exploit code into version 2.1.1 of WordPress. They are therefore recommending that everyone upgrade from version 2.1.1 to version 2.1.2.
If you installed WordPress through your hosts control panel, you should contact them and request that they provide version 2.1.2 for installation.
Tags: Security, Technology, update, urgent, wordpress_2.1