---
id: CVE-2026-26143
title: Microsoft PowerShell Security Feature Bypass Vulnerability
summary: >-
  Improper input validation in Microsoft PowerShell allows an unauthorized
  attacker to bypass a security feature locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-20
vendor: Microsoft
product: PowerShell 7.4
affected:
  - powershell_7.4 >= 7.4.0 < 7.4.14
  - powershell_7.5 >= 7.5.0 < 7.5.5
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-04-16T13:24:29.195623Z'
published: '2026-04-14'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:25:38.069Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-26143'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26143'
    label: Microsoft PowerShell Security Feature Bypass Vulnerability
tags:
  - cve.org
epss: 0.00466
epssPercentile: 0.37752
ingestedAt: '2026-09-25T18:14:20.437Z'
---

## Overview

Improper input validation in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature locally.

## Affected

- `powershell_7.4 >= 7.4.0 < 7.4.14`
- `powershell_7.5 >= 7.5.0 < 7.5.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.