Microsoft Internet Explorer 8.0 Beta 2 relies on the XDomainRequestAllowed HTTP header to authorize data exchange between domains which allows remote attackers to bypass the product's XSS Filter protection mechanism and conduct XSS and cross-domain attacks by injecting this header after a CRLF sequence related to \XDomainRequest Allowed Injection (XAI).\ NOTE: the vendor has reportedly stated that the XSS Filter intentionally does not attempt to \address every conceivable XSS attack scenario.\