Microsoft PowerShell 7.4.x < 7.4.21 / 7.5.x < 7.5.12 / 7.6.x < 7.6.7 Multiple Vulnerabilities (October 2026)

high Nessus Plugin ID 366463

Language:

Synopsis

The Microsoft PowerShell install on the remote host is affected by multiple vulnerabilities.

Description

The version of Microsoft PowerShell installed on the remote host is 7.4.x prior to 7.4.21, 7.5.x prior to 7.5.12, or 7.6.x prior to 7.6.7. It is, therefore, affected by multiple vulnerabilities:

- Reliance on untrusted inputs in a security decision in Microsoft PowerShell allows an unauthorized attacker to execute code over a network. (CVE-2026-96251)

- Improperly implemented security check for standard in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature over a network. (CVE-2026-96303)

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 7.4.21, 7.5.12, 7.6.7, or later.

Plugin Details

Severity: High

ID: 366463

File Name: smb_nt_ms26_oct_powershell.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows : Microsoft Bulletins

Published: 10/16/2026

Updated: 10/16/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.37

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-2026-96251

CVSS v3

Risk Factor: High

Base Score: 8.8

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

Vulnerability Information

CPE: cpe:/a:microsoft:powershell

Required KB Items: SMB/Registry/Enumerated, WMI/Windows App Store/Enumerated, installed_sw/Microsoft.PowerShell

Patch Publication Date: 10/13/2026

Vulnerability Publication Date: 10/13/2026

Reference Information

CVE: CVE-2026-96251, CVE-2026-96303

IAVA: 2026-A-1131

Detections

Analytics