From Information Free Network and WordPress.Com/WordPress.Org

ALERT new WORDPRESS security UPDATE WP2.3.3 wordpress 2.3.3

WordPress 2.3.3 is an urgent security release
A flaw was found in our XML-RPC implementation such that a specially
crafted request would allow any valid user to edit posts of any other
user on that blog. In addition to fixing this security flaw, 2.3.3
fixes a few minor bugs If you are interested only in the security fix, download the fixed version of xmlrpc.php and copy it over your existing xmlrpc.php. Otherwise, you can get the entire release here

Also, there is a vulnerability in the WP-Forum plugin that is being actively exploited right now. If you are using this plugin, please remove it until an update is available.

Since we are talking security, remember to use strong passwords and
change them regularly. While you’re updating WP and your plugins,
consider refreshing your passwords.

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