Microsoft Security Announcement

Microsoft has warned of a serious - and as yet unpatched vulnerability - in Word. Hackers (albeit to a limited extent) are exploiting the zero-day flaw in its ubiquitous Office application, Redmond warns.

The flaw - which stems from an unspecified memory corruption bug - doesn't just affect Windows users. Microsoft Word 2000, Microsoft Word 2002, Microsoft Office Word 2003, Microsoft Word Viewer 2003, Microsoft Word 2004 for Mac, and Microsoft Word 2004 v. X for Mac, along with Microsoft Works 2004, 2005, and 2006 are all potentially vulnerable. Users tricked into opening maliciously constructed Word files are liable to find their systems compromised.

Source:
http://www.theregister.co.uk/2006/12/06/unpatched_word_flaw/