Revision Note: V1.1 (November 3, 2010): Added the opening of HTML mail in the Restricted sites zone as a mitigating factor, the automated Microsoft Fix it solution to the CSS workaround, and a finder acknowledgment. Removed reading e-mail in plain text as a workaround. Also clarified content in the EMET, DEP, and CSS workarounds. Advisory Summary:Microsoft is investigating new, public reports of a vulnerability in all supported versions of Internet Explorer. The main impact of the vulnerability is remote code execution. This advisory contains workarounds and mitigations for this issue.