Detections
Analytics

Microsoft PowerShell 7.4.x < 7.4.22 / 7.5.x < 7.5.13 / 7.6.x < 7.6.9 RCE (macOS)

critical Nessus Plugin ID 374268

Synopsis

The Microsoft PowerShell install on the remote macOS host is affected by a remote code execution vulnerability.

Description

The version of Microsoft PowerShell installed on the remote macOS host is 7.4.x prior to 7.4.22, 7.5.x prior to 7.5.13, or 7.6.x prior to 7.6.9. It is, therefore, affected by a remote code execution vulnerability. An out-of-bounds write in the Brotli decoder used by PowerShell 7 allows an unauthorized attacker to elevate privileges over a network.
The issue affects use of Invoke-WebRequest or Invoke-RestMethod against websites without SSL or that the user does not control.

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 PowerShell version 7.4.22, 7.5.13, 7.6.9, or later.

See Also

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111497

http://www.nessus.org/u?fda06208

Plugin Details

Severity: Critical

ID: 374268

File Name: macos_microsoft_powershell_CVE-2026-111497.nasl

Version: 1.1

Type: Local

Agent: macosx

Published: 10/30/2026

Updated: 10/30/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.4

Percentile: 99.83

CVSS v2

Risk Factor: Critical

Base Score: 10

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

CVSS Score Source: CVE-2026-111497

CVSS v3

Risk Factor: Critical

Base Score: 9.8

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/a:microsoft:powershell, cpe:/o:apple:mac_os_x

Required KB Items: Host/MacOSX/Version, installed_sw/PowerShell

Patch Publication Date: 10/25/2026

Vulnerability Publication Date: 10/21/2026

Reference Information

CVE: CVE-2026-111497

CWE: 252, 787

IAVA: 2026-A-1202