Windows Defender <= 1.1.26070.7 Elevation of Privilege (ShieldBreak) (CVE-2026-69414)

high Nessus Plugin ID 364472

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Synopsis

An antimalware application installed on the remote host is affected by an elevation of privilege vulnerability.

Description

The Malware Protection Engine version of Microsoft Windows Defender installed on the remote Windows host is prior to or equal to 1.1.26070.7. It is, therefore, affected by an elevation of privilege vulnerability:

- Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as 'ShieldBreak'. (CVE-2026-69414)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Enable automatic updates to update the malware engine for the relevant antimalware applications. Refer to Knowledge Base Article 2510781 for information on how to verify that MMPE has been updated.

Plugin Details

Severity: High

ID: 364472

File Name: microsoft_windows_defender_CVE-2026-69414.nasl

Version: 1.2

Type: Local

Agent: windows

Family: Windows

Published: 10/9/2026

Updated: 10/12/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

Percentile: 99.87

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-69414

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:windows_defender, cpe:/o:microsoft:windows

Required KB Items: installed_sw/Windows Defender

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/3/2026

Vulnerability Publication Date: 8/14/2026

Reference Information

CVE: CVE-2026-69414

IAVA: 2026-A-1102

Detections

Analytics