Microsoft says attackers are exploiting a previously unknown security hole in Microsoft Word. The flaw is present in Word 2003, 2007, 2013, Word Viewer and Office for Mac 2011. Affected users can apply a special Fix-It solution that disables opening of RTF content in Word. Microsoft says its working on an official fix for the flaw, but that in the meantime affected users must apply a Fix-it solution. For more information on how to harden your email client is to render emails in plain text.”]
Source: https://krebsonsecurity.com/2014/03/microsoft-warns-of-word-2010-exploit/