(http://i51.tinypic.com/2jenrs0.jpg)
Yes, as you can see above (and in a Software Update near you), Apple has released Security Update 2010-006, the latest OS X issue-fixer of the year (http://support.apple.com/kb/HT1222). It's recommended for all users, so run your SU, let it download and install, and you'll be good to go.
This one apparently fixes an issue where a remote attacker could have snuck into AFP shared folders without having a password. Apple releases OS Security Updates a few times a year, and given how simple it is to update and install them, you should go ahead and update as soon as possible.