I copy verbatim the beginning of the bulletin released by Microsoft itself about this vulnerability found in software: Some Major security issues identified As can be read in the bulletin released by Microsoft itself, it explains that this update fixes a vulnerability that could allow remote code execution. This time the released version of MIcrosoft Office is 14.3.5 and basically it is a security update to Unlike its previous update that made it compatible with Office 365. Microsoft Office releases an update for its Mac version of Office 2011 after the last update was in May.