source: https://www.securityfocus.com/bid/10689/info A vulnerability exists in Microsoft Internet Explorer that may allow cross-domain/cross-zone scripting. It is reported that the vulnerability presents itself due to a failure to properly validate trust relationships between method calls that are made in separate Internet Explorer windows. This may make it possible for script code to access properties of a foreign domain or Security Zone. Exploitation may permit execution of arbitrary code as the victim user. The following example was provided: ; This will reportedly generate two alerts describing the assign().