CVE-2026-96303: Microsoft PowerShell Security Feature Bypass Vulnerability

Overview

Severity
Medium (CVSS 6.5)
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
Category
Security Feature Bypass
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2026-Oct
Released
2026-10-13

Description

Improperly implemented security check for standard in Microsoft PowerShell allows an unauthorized attacker to bypass a security feature over a network.

FAQ

What kind of security feature could be bypassed by successfully exploiting this vulnerability? An attacker who successfully exploited this vulnerability could bypass Windows Defender Application Control and PowerShell Constrained Language Mode restrictions, allowing untrusted code to run with capabilities those protections are designed to block.

Affected Products (3)

Developer Tools

  • PowerShell 7.5
  • PowerShell 7.4
  • PowerShell 7.6

Security Updates (3)

Acknowledgments

<a href="https://www.linkedin.com/in/moathaloufi/">Moath Aloufi</a>, <a href="https://www.linkedin.com/in/nguyen-hoang-quoc-an-009863267/">kayiz</a> with <a href="https://lp.com.vn/">Lien Phat Technology Corporation</a>

Revision History

  • 2026-10-13: Information published.