Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since April 14, 2026.
CVE-2009-0238
Microsoft Office Remote Code Execution vulnerability
Added to KEV April 14, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2009-0238
- CWE
- CWE-94
- Affected products
- Office · Microsoft Office · Microsoft
What happened
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.
What it means for your business
Microsoft Office is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2009-0238). 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. CISA remediation due date: 2026-04-28. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: April 28, 2026
Sources
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