CVE-2011-1989: Microsoft Excel

High severity, CVSS 9.3. EPSS: 27.8% chance of exploitation in the next 30 days.

Microsoft Excel 2003 SP3 and 2007 SP2; Excel in Office 2007 SP2; Excel 2010 Gold and SP1; Excel in Office 2010 Gold and SP1; Office 2004, 2008, and 2011 for Mac; Open XML File Format Converter for Mac; Excel Viewer SP2; Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP2; Excel Services on Office SharePoint Server 2007 SP2; Excel Services on Office SharePoint Server 2010 Gold and SP1; and Excel Web App 2010 Gold and SP1 do not properly parse conditional expressions associated with formatting requirements, which allows remote attackers to execute arbitrary code via a crafted spreadsheet, aka "Excel Conditional Expression Parsing Vulnerability."

Affected products

• Microsoft Excel: version 2003 only; version 2007 only; version 2010 only
• Microsoft Excel Viewer: any version
• Microsoft Excel Web App: version 2010 only
• Microsoft Office: version 2004 only; version 2007 only; version 2008 only; version 2010 only; version 2011 only
• Microsoft Office Compatibility Pack: version 2007 only
• Microsoft Open XML File Format Converter: any version
• Microsoft SharePoint Server: version 2007 only; version 2010 only

Published 2011-09-15. Last modified 2026-06-16.