I have finally upgraded to this blog to WordPress 1.5.1.3. A couple of security issues with XML RPC are fixed by this release. I was a bit slow, since the fixes were released for over a week now, but not to worry – my PHP installation already had all the fixes for XML RPC installed.
Slashdot is running a story on the issue. One of the comments shows an easy way of upgrading PEAR that not everyone might be familiar with:
pear clear-cache pear upgrade XML_RPC