This vulnerability allows attackers to execute arbitrary code 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 IShdocvwBroker::NewMessage API. Calling this API causes the broker process to load a DLL from a potentially unsafe location. An attacker can leverage this vulnerability to execute code under the context of the user at medium integrity.