VulnerabilityModified

CVE-2011-1989

HIGH 9.3EPSS 27.8%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 27.8%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.

Description

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."

CVSS 2.0: 9.3 HIGHAV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS: 27.77% probability · 98th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-20
Affected: microsoft/excel · microsoft/excel viewer · microsoft/excel web app · microsoft/office · microsoft/office compatibility pack · microsoft/open xml file format converter · microsoft/sharepoint server
Source: secure@microsoft.com

EPSS trend

EPSS moved from 27.8% on 11 October 2026 to 27.8% on 26 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.