"... Executive Summary
This security update resolves five privately reported vulnerabilities and one publicly disclosed vulnerability. All of the vulnerabilities could allow remote code execution if a user views a specially crafted Web page using Internet Explorer. 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 rated Critical for all supported releases of Internet Explorer. For more information, see the subsection, Affected and Non-Affected Software, in this section.
The security update addresses these vulnerabilities by modifying the way that Internet Explorer handles the error resulting in the exploitable condition. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection under the next section, Vulnerability Information.
Recommendation. Microsoft recommends that customers apply the update immediately..."