There has been some news regarding a new word vulnerability. There is not much information available. Basically you have to open an infected document for the attack to become successful.
Word Viewer 2003
Word 2004 for Mac
Word 2004 v. X for Mac
Works 2004, 2005, and 2006
On Microsoft's site we see:
"Upon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs."
We are investigating this issue, and will forward more information when it becomes available.