CVE-2026-55011
Microsoft Defender Remote Code Execution vulnerability
MSRC advisory July 14, 2026
Alert details
- Source feed
- Microsoft MSRC
- CVE ID
- CVE-2026-55011
- Affected products
- Microsoft Defender Remote Code Execution · Microsoft Microsoft Defender Remote Code Execution · Microsoft
What happened
Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.
What it means for your business
Microsoft Defender Remote Code Execution vulnerability (CVE-2026-55011) was added to Microsoft’s security update guidance. Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally. If you need help checking exposure, call (864) 335-9223.
Sources
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