Time to upgrade to WordPress 2.1.3 again. A security update release is now available for both the 2.1 and 2.0 branches of WordPress and is highly recommended for all users of both branches.
These releases include fixes for several publicly known minor XSS issues, one major XML-RPC issue, and a proactive full sweep of the WordPress codebase to protect against future problems.
When a upgrade is announced, my next stop is Mark on WordPress, where Mark Jaquith usually puts in effort to figure out the changed files and create some very useful files to help you identify the changes and upgrade wordpress faster. Of course it is unofficial wordpress stuff.
These are the 3 files you will usually find –
*Changed Files List with a list of all the files that have changed since the last (2.1.2) release.
*Changed Files ZIP – this is a zip file that includes only the files that have changed since the last (2.1.2) release.
*Changes Diff – This is a diff file (a patch) with all the changes made since the last (2.1.2) release.
See which file suits your need. Never forget to do a full file and database backup before attempting to upgrade WordPress using these or any other files. Mark is a wordpress developer and you can trust the files he compiles. I have been using his files for the last few times and lot of FTP time is saved.