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Privilege Escalation Vulnerability in Microsoft Defender

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

Microsoft Malware Protection Engine

Overview

A vulnerability has been reported in Microsoft Malware Protection Engine which could allow an attacker with low-level local access to elevate privileges on an affected system.

 

Target Audience:

Organizations and individuals using Microsoft Malware Protection Engine

Risk Assessment:

High risk of privilege escalation and potential compromise of the affected system.

Impact Assessment:

Potential for unauthorized access of data and compromise of the affected system.

Description

Microsoft Malware Protection Engine (MMPE) is a core security component used by Microsoft security products, including Microsoft Defender Antivirus, to detect, analyze, and help remove malware and other potentially unwanted or malicious software from Windows systems.

This vulnerability exists due to improper access control/privilege management within the Microsoft Malware Protection Engine.

Successful exploitation of this vulnerability could allow an attacker with low-level local access to elevate privileges on an affected system, potentially resulting in unauthorized access to protected resources and the complete compromise of the affected system.

Solution

Apply appropriate security updates as mentioned in

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-69414

Vendor Information

Microsoft

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-69414

References

 

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-69414

CVE Name

CVE-2026-69414

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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