eWeek announced a security alert concerning PhpBB. You might want to read it to make sure you are not a risk if you have PhpBB installed.

Cnet reports it has infected 40,000 Web sites but Google has reported:

On Wednesday, a Google representative told ZDNet Australia that though Google users were not at risk from Santy, the search company had started blocking attempts by the worm to replicate.

"We are aware of an Internet worm that exploits a vulnerability in third-party Web servers that use PHP bulletin board software. While the worm does not put Google users at risk, we are working to help stop its propagation by blocking queries to Google that are generated by the worm," the representative said.

You may not be at risk, but if you run an older version of Php, it might be worthwhile to check out.