CVE-2026-55012
An attacker can exploit multiple vulnerabilities in Microsoft Malware Protection Engine and Microsoft Defender to execute arbitrary code, gain elevated permissions, or disclose sensitive information.
CSIRTS triage
- What
- Multiple vulnerabilities can be exploited to execute arbitrary code and disclose sensitive information.
- Who is affected
- Users of Microsoft Malware Protection Engine and Microsoft Defender are affected.
- Urgency
- Remediation is medium priority due to the potential for exploitation.
- Action
- Update Microsoft Malware Protection Engine and Defender to the latest versions.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all EPSS-scored CVEs.
Advisory coverage (5)
- medium[NEW] [medium] Microsoft Malware Protection Engine and Defender: Multiple vulnerabilitiescert-bund · 2026-07-15
- unknownMultiple vulnerabilities in Microsoft products (July 15, 2026)cert-fr-avis · 2026-07-15
- unknownNCSC-2026-0236 [1.00] [M/H] Vulnerabilities fixed in Microsoft Defenderncsc-nl · 2026-07-14
- highCVE-2026-55012: Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execut…nvd · 2026-07-14
- highCVE-2026-55012: Microsoft Defender Remote Code Execution Vulnerabilitymsrc · 2026-07-14
External references
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[](https://www.csirts.com/cve/CVE-2026-55012)