This vulnerability allows remote attackers to escape Protected Mode on vulnerable installations of Microsoft Internet Explorer User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the HelpPane executable. The issue lies in the validation of the integrity level of the COM client, which is performed with a comparison against the integrity level of the desktop’s shell. An attacker can leverage this vulnerability to execute code under the context of the user at medium integrity.