Technical Information

Brief overview of the risk:
The security update addresses the vulnerabilities by correcting how SharePoint Server and Web Applications sanitize specially crafted page content.
Detailed Information on the risk:

An elevation of privilege vulnerability exists in Microsoft SharePoint Server. An attacker who successfully exploited this vulnerability could perform cross-site scripting attacks on affected systems and run script in the security context of the logged-on user.

Further information on this exploit is available at : MS14-022