CVE-2013-1330: Microsoft Office Web Apps

High severity, CVSS 10.0. EPSS: 27.4% chance of exploitation in the next 30 days.

The default configuration of Microsoft SharePoint Portal Server 2003 SP3, SharePoint Server 2007 SP3 and 2010 SP1 and SP2, and Office Web Apps 2010 does not set the EnableViewStateMac attribute, which allows remote attackers to execute arbitrary code by leveraging an unassigned workflow, aka "MAC Disabled Vulnerability."

Affected products

• Microsoft Office Web Apps: version 2010 only
• Microsoft SharePoint Foundation: version 2010 only
• Microsoft SharePoint Portal Server: version 2003 only
• Microsoft SharePoint Server: version 2007 only; version 2010 only
• Microsoft SharePoint Services: version 2.0 only; version 3.0 only

Published 2013-09-11. Last modified 2026-06-16.