With November 2015 PU we have released security fixes for SharePoint which are offered through Microsoft Update.
For the following SharePoint products and components fixes have been released:
SharePoint 2007 Suite:
- Excel Services 2007
SharePoint 2010 Suite:
- Excel Services 2010
- Word Automation Services 2010
- Office Web Apps 2010
SharePoint 2013 Suite:
- Excel Services 2013
- Word Automation Services 2013
- Office Web Apps 2013
See the security bulletin below for more details and KB number for the relevant fixes: