CVE-2005-4089: Microsoft Internet Explorer allows remote attackers to bypass cross-domain security restrictions and obtain...

Security readout for executives and security teams

This is an old Internet Explorer flaw where a malicious web page could bypass browser same-origin protections and read sensitive information from another domain. The bundled sources describe information disclosure, not system takeover. Business urgency is mainly for environments that still run legacy Internet Explorer or old Windows images. Exposure is most plausible on legacy systems where Microsoft Internet Explorer remains usable for browsing untrusted content. The bundled CVE metadata does not identify affected versions, so exposure should be confirmed through Microsoft MS06-021 and OVAL definitions rather than inferred broadly. Treat this as a legacy-browser exposure issue. It is not supported by current exploitation evidence in the bundle, but any remaining unpatched Internet Explorer use creates unnecessary data exposure risk and should be removed or tightly contained. Mitigation focus: Review Microsoft MS06-021 and apply applicable cumulative Internet Explorer updates.; Retire or disable legacy Internet Explorer where business workflows allow.; Restrict legacy browser access to untrusted websites and internet email links..

Prepared

Jun 29, 2026, 16:03 UTC (UTC+00:00)

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