CVE-2008-5555: Microsoft Internet Explorer 8.0 Beta 2 relies on the XDomainRequestAllowed HTTP header to authorize data ex...

Security readout for executives and security teams

This is an old issue in Microsoft Internet Explorer 8.0 Beta 2. A malicious site could bypass that beta browser's XSS Filter by abusing a cross-domain authorization header behavior. Business urgency is mainly legacy exposure: modern environments are unlikely to be affected unless this beta browser remains in use. Exposure appears limited to users running Internet Explorer 8.0 Beta 2 or environments that still permit it. The supplied affected-product metadata is incomplete, listing n/a entries despite the CVE title and description naming IE 8.0 Beta 2. Low urgency for current enterprise stacks, but validate legacy browser exposure. If IE 8.0 Beta 2 exists in production or lab workflows, remove it because the sources provide no safe supported remediation path. Mitigation focus: Check Microsoft or vendor guidance for any historical advisory or final product behavior.; Remove or block Internet Explorer 8.0 Beta 2 from managed environments.; Do not rely on browser XSS filters as a primary security control..

Prepared

Jun 28, 2026, 11:41 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.