CVE-2006-2055: Microsoft Outlook

Medium severity, CVSS 5.0. EPSS: 15.4% chance of exploitation in the next 30 days.

Argument injection vulnerability in Microsoft Outlook 2003 SP1 allows user-assisted remote attackers to modify command line arguments to an invoked mail client via " (double quote) characters in a mailto: scheme handler, as demonstrated by launching Microsoft Outlook with an arbitrary filename as an attachment. NOTE: it is not clear whether this issue is implementation-specific or a problem in the Microsoft API.

Affected products

• Microsoft Outlook: version 2003 only

Published 2006-04-26. Last modified 2026-06-16.