Microsoft Windows App < 11.3.2 Local Privilege Escalation (CVE-2026-21517)

high Nessus Plugin ID 298951

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Synopsis

The remote macOS host is affected by a local privilege escalation vulnerability.

Description

The version of Microsoft Windows App installed on the remote macOS host is prior to 11.3.2. It is, therefore, affected by a local privilege escalation vulnerability:

- Improper link resolution before file access ('link following') in Windows App for Mac allows an authorized attacker to elevate privileges locally. (CVE-2026-21517)

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

Solution

Upgrade to Microsoft Windows App 11.3.2 or later.

Plugin Details

Severity: High

ID: 298951

File Name: macos_windows_app_CVE-2026-21517.nasl

Version: 1.3

Type: local

Agent: macosx

Family: MacOS X Local Security Checks

Published: 2/13/2026

Updated: 2/27/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 6

Temporal Score: 4.4

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

CVSS Score Source: CVE-2026-21517

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.1

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

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

Vulnerability Information

CPE: x-cpe:/a:microsoft:windows_app

Required KB Items: installed_sw/Windows App

Exploit Ease: No known exploits are available

Patch Publication Date: 2/10/2026

Vulnerability Publication Date: 2/10/2026

Reference Information

CVE: CVE-2026-21517

IAVA: 2026-A-0113

Detections

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