CVE-2004-0203: Cross-site scripting (XSS) vulnerability in Outlook Web Access for Exchange Server 5.5 Service Pack 4 allow...

Security readout for executives and security teams

This is a legacy Outlook Web Access flaw in Exchange Server 5.5 SP4. A remote attacker could use the webmail interface to make a victim see attacker-controlled script or spoofed content. Business urgency depends almost entirely on whether any old Exchange 5.5 OWA instance is still reachable. Likely exposure is narrow: organizations still running or exposing Exchange Server 5.5 SP4 Outlook Web Access. Most modern Exchange environments are unlikely to be affected based on the provided record, but legacy systems, archives, and forgotten internet-facing OWA hosts should be checked. Treat this as a legacy exposure cleanup item unless Exchange 5.5 OWA is still reachable. If it is exposed, prioritize containment because obsolete internet-facing mail systems create disproportionate risk even when current exploit evidence is absent. Mitigation focus: Review Microsoft MS04-026 for the vendor-approved update and deployment guidance.; Retire or isolate any remaining Exchange Server 5.5 OWA systems.; Restrict external access to legacy OWA endpoints while remediation is assessed..

Prepared

Jun 30, 2026, 04:32 UTC (UTC+00:00)

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