Critical Security Update for Internet Explorer
The vulnerability could allow remote code execution if a user views a specially crafted webpage using Internet Explorer. An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.
Microsoft Security Bulletin is available here - https://technet.microsoft.com/library/security/MS15-093