Microsoft Security Bulletin MS03-040 for Windows

Name: Microsoft Security Bulletin MS03-040
Author: Microsoft

Used Microsoft Security Bulletin MS03-040 for Windows?

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Editors’ Review

Download.com staffFebruary 20, 2026

This cumulative patch for Internet Explorer 5.01, 5.5, and 6.0 bundles prior fixes. It eliminates critical vulnerabilities that allow remote attackers to run arbitrary code via malicious websites or HTML emails.

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Pros
- Includes all functionality from previously released patches.
- Eliminates arbitrary code execution via improper object type determination in popups.
- Patches XML data binding flaw that allows remote arbitrary code execution.
- Modifies DHTML Behavior handling in the Internet Explorer Restricted Zone.
- Prevents attackers running script code in the higher-security Internet Zone.
Cons
- Requires specific HTML Help update (KB 811630) to maintain full functionality.
- Patch causes window.showHelp() function to cease operating otherwise.
- Recommended Windows Media Player update (KB 828026) must be installed separately.
- Does not automatically restrict WMP's ability to launch URLs from other zones.