The WebBrowser ActiveX control or the Internet Explorer HTML rendering engine (MSHTML) as used in Internet Explorer 6 allows remote attackers to execute arbitrary code in the Local Security context by using the showModalDialog method and modifying the location to execute code such as Javascript as demonstrated using (1) delayed HTTP redirect operations and an HTTP response with a Location: header containing a \URL:\ prepended to a \ms-its\ protocol URI or (2) modifying the location attribute of the window as exploited by the Download.ject (aka Scob aka Toofer) using the ADODB.Stream object.