High severity · published Jul 14, 2026
CVE-2026-55012
Microsoft Defender Remote Code Execution Vulnerability
7.8
CVSS
0.5%
EPSS
No
On KEV
Description
Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MM
Microsoft Malware Protection Engine · Microsoft
1.1.0.0 before 1.1.26060.3008 · source: vendor
MP
Malware Protection Engine · Microsoft
before 1.1.26060.3008 · source: NVD
Affected product
MM
Microsoft Malware Protection Engine
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55012
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55012
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55012
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