CVE-2009-0238

Microsoft Office Remote Code Execution

Microsoft — Office

Added to KEV catalog: 14 April 2026
Federal remediation due date: 28 April 2026
Weakness classification (CWE): CWE-94

CISA Description

Microsoft Office Excel contains a remote code execution vulnerability that could allow an attacker to take complete control of an affected system if a user opens a specially crafted Excel file that includes a malformed object.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes

https://learn.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-009 ; https://nvd.nist.gov/vuln/detail/CVE-2009-0238

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