Microsoft Office Remote Code Execution. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 14/04/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| excel | = 2000= 2002= 2003= 2007 | |
| office | = 2004= 2008 | |
| office compatibility pack | = 2007 | |
| office excel viewer | = 2003 |
Microsoft Office Excel 2000 SP3, 2002 SP3, 2003 SP3, and 2007 SP1; Excel Viewer 2003 Gold and SP3; Excel Viewer; Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1; and Excel in Microsoft Office 2004 and 2008 for Mac allow remote attackers to execute arbitrary code via a crafted Excel document that triggers an access attempt on an invalid object, as exploited in the wild in February 2009 by Trojan.Mdropper.AC.
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