CVE-2003-1328: Microsoft Ie

High severity, CVSS 7.5. EPSS: 38.9% chance of exploitation in the next 30 days.

The showHelp() function in Microsoft Internet Explorer 5.01, 5.5, and 6.0 supports certain types of pluggable protocols that allow remote attackers to bypass the cross-domain security model and execute arbitrary code, aka "Improper Cross Domain Security Validation with ShowHelp functionality."

Affected products

• Microsoft Ie: version 6.0 only
• Microsoft Internet Explorer: version 5.0.1 only; version 5.5 only; version 6.0 only

Published 2003-02-19. Last modified 2026-06-16.