PHP Blogging Apps Open to XML-RPC Exploits

Fear and panic!

This article explicitly mentions WordPress as being vulnerable to a newly discovered security hole in the underlying PHP XML-RPC libraries.

This WordPress support article outlines a couple of fixes.

Uprade to WordPress 1.5.1.3
Or, if you own the server (as I do):
- pear clear-cache
- pear upgrade XML_RPC

And all is now right with the world.