ZDI-CAN-31478: ZDI-26-414: Microsoft PowerShell Help Directory Traversal Remote Code Execution Vulnerability

Published Jul 15, 2026

Updated

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft PowerShell. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-40400.

Affected Software

1 affected component

Microsoft PowerShell

Event History

Jul 15, 2026

Advisory Published

via ZDI·05:00 AM

Data Sourced

via ZDI·05:00 AM

Description

Frequently Asked Questions

What is the severity of ZDI-CAN-31478?

The severity of ZDI-CAN-31478 is rated at 7.8 according to the CVSS.

How do I fix ZDI-CAN-31478?

To fix ZDI-CAN-31478, ensure that you apply the latest security patches provided by Microsoft for PowerShell.

What is the impact of the ZDI-CAN-31478 vulnerability?

ZDI-CAN-31478 allows remote attackers to execute arbitrary code on affected installations of Microsoft PowerShell.

Is user interaction required to exploit ZDI-CAN-31478?

Yes, user interaction is required as the target must visit a malicious page or open a malicious file to exploit ZDI-CAN-31478.

Which software is affected by ZDI-CAN-31478?

The affected software by ZDI-CAN-31478 is Microsoft PowerShell.