Microsoft Security Bulletin MS13-008 for this update states:
This security update resolves one publicly disclosed vulnerability in 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. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
This security update is titled Security Update for Internet Explorer (2799329) and is available immediately through Windows Update. Please be sure to check for new updates in Windows Update and install this update. Please note that this update will require you to reboot your computer, so be sure to save any opened files.