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CVE-2004-0380

The MHTML protocol handler in Microsoft Outlook Express 5.5 SP2 through Outlook Express 6 SP1 allows remote attackers to bypass domain restrictions and execute arbitrary code, as demonstrated on Internet Explorer using script in a compiled help (CHM) file that references the InfoTech Storage (ITS) protocol handlers such as (1) ms-its, (2) ms-itss, (3) its, or (4) mk:@MSITStore, aka the "MHTML URL Processing Vulnerability."

Published: May 4, 2004 Modified: Jun 16, 2026

CVSS Metrics

Affected Products (2)

Vendor Product Version
microsoft outlook_express 5.5
microsoft outlook_express 6.0

GitHub Security Advisory GHSA-wv58-cxvm-2w2g

The MHTML protocol handler in Microsoft Outlook Express 5.5 SP2 through Outlook Express 6 SP1...

Risk Scores

CVSS Score 10.0 / 10
EPSS Score 63.25%

Top 1% most likely to be exploited

Threat Score 59 / 100

Data Sources

NVD EPSS GitHub