---
title: "CVE-2004-0380: The MHTML protocol handler in Microsoft… | CubePath"
description: "The MHTML protocol handler in Microsoft Outlook Express 5.5 SP2 through Outlook Express 6 SP1 allows remote attackers to bypass domain restrictions…"
language: en
source: https://cubepath.com/security/cve/CVE-2004-0380
---

# CVE-2004-0380: The MHTML protocol handler in Microsoft… | CubePath

## Description

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."

Official description from the CVE record, published by mitre. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2004-0380)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.63250 (63.2% probability)

Percentile

99.2%

Scores of

Nov 10, 2026

Model

v2026.06.15

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [oval:org.mitre.oval:def:990](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A990)  (oval.cisecurity.org) vdb-entry signature
- [9105](http://www.securityfocus.com/bid/9105)  (securityfocus.com) vdb-entry
- [VU#323070](http://www.kb.cert.org/vuls/id/323070)  (kb.cert.org) third-party-advisory
- [oval:org.mitre.oval:def:1010](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1010)  (oval.cisecurity.org) vdb-entry signature
- [outlook-mhtml-execute-code(15705)](https://exchange.xforce.ibmcloud.com/vulnerabilities/15705)  (exchange.xforce.ibmcloud.com) vdb-entry
- [MS04-013](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2004/ms04-013)  (docs.microsoft.com) vendor-advisory
- [9658](http://www.securityfocus.com/bid/9658)  (securityfocus.com) vdb-entry
- [TA04-104A](http://www.us-cert.gov/cas/techalerts/TA04-104A.html)  (us-cert.gov) third-party-advisory
- [oval:org.mitre.oval:def:882](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A882)  (oval.cisecurity.org) vdb-entry signature
- [k-otik.net/bugtraq/02.18.InternetExplorer.php](http://www.k-otik.net/bugtraq/02.18.InternetExplorer.php)
- [20040328 IE ms-its: and mk:@MSITStore: vulnerability](http://www.securityfocus.com/archive/1/358913)  (securityfocus.com) mailing-list
- [20040219 Microsoft Internet Explorer Unspecified CHM File Processing Arbitrary Code Execution Vulnerability (bid 9658)](http://www.securityfocus.com/archive/1/354447)  (securityfocus.com) mailing-list
- [oval:org.mitre.oval:def:1028](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1028)  (oval.cisecurity.org) vdb-entry signature
- [10523](http://secunia.com/advisories/10523)  (secunia.com) third-party-advisory

## Timeline

1. ID reserved Apr 5, 2004
2. Record published Apr 6, 2004
3. Record last updated Aug 8, 2024

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:58 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)