Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since January 7, 2026.
CVE-2009-0556
Microsoft Office PowerPoint Code Injection Vulnerability
Added to KEV January 7, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2009-0556
- CWE
- CWE-94
- Affected products
- Office · Microsoft Office · Microsoft
What happened
Microsoft Office PowerPoint contains a code injection vulnerability that allows remote attackers to execute arbitrary code via a PowerPoint file with an OutlineTextRefAtom containing an invalid index value that triggers memory corruption.
What it means for your business
Microsoft Office is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2009-0556). Microsoft Office PowerPoint contains a code injection vulnerability that allows remote attackers to execute arbitrary code via a PowerPoint file with an OutlineTextRefAtom containing an invalid index value that triggers memory corruption. CISA remediation due date: 2026-01-28. 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: January 28, 2026
Sources
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