Some time before on 8th December WordPress released the New version which is 3.0.3. What wordpress is saying about this release.
WordPress 3.0.3 released with Fixes issues in the XML-RPC remote publishing interface
This release fixes issues in the remote publishing interface, which under certain circumstances allowed Author- and Contributor-level users to improperly edit, publish, or delete posts.
These issues only affect sites that have remote publishing enabled.
Remote publishing is disabled by default, but you may have enabled it to use a remote publishing client such as one of the WordPress mobile apps. You can check these settings on the “Settings → Writing” screen.
With this release they Improved the capabilites checking in the XMLRPC code. They modified the following files.
Enjoy the wordpress 3.0.3 version.