ADODB.Stream object from Internet Explorer (KB870669)

An ADO stream object represents a file in memory. The stream object contains several methods for reading and writing binary files and text files. When this by-design functionality is combined with known security vulnerabilities in Microsoft Internet Explorer, an Internet Web site could execute script from the Local Machine zone.

This behavior occurs because the ADODB.Stream object permits access to the hard disk when the ADODB.Stream object is hosted in Internet Explorer.

The vendor has released updates, please see the references for more information.