This update resolves vulnerabilities in Microsoft Office Web Apps Server 2013 that could allow remote code execution if an authenticated attacker sends specially crafted page content to a targeted computer that is running Microsoft SharePoint Server.
Improvements and fixes
This update also contains fixes for the following nonsecurity issues:- When you edit an Excel Workbook in Excel Web App, managed metadata such as enterprise keywords is lost.
- Localizes some strings for the UI for Office Web App Server 2013 applications because Bing Image Search replaces Office.com Clip Art when you insert online pictures.
- Translations of some terms are improved in multiple languages to make sure of accurate meaning.