Windows PowerShell
CVE-2026-40400 — Windows PowerShell Remote Code Execution Vulnerability
Executive Summary
Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a network.
Overview
8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Exploitation Unlikely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.0
EPSS Score
0.00701
probability of exploitation in the next 30 days
0.50067 percentile - updated 2026-08-14
View on FIRST.org
Affected Products
27 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1607 for 32-bit Systems | 5099535 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5099535 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5099538 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5099538 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5099539 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5099539 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5099539 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 22H2 for 32-bit Systems | 5099539 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 22H2 for ARM64-based Systems | 5099539 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 22H2 for x64-based Systems | 5099539 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 24H2 for ARM64-based Systems | 5101650 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 24H2 for x64-based Systems | 5101650 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 25H2 for ARM64-based Systems | 5101650 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 25H2 for x64-based Systems | 5101650 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 26H1 for ARM64-based Systems | 5101649 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 version 26H1 for x64-based Systems | 5101649 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2012 | 5099445 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2012 (Server Core installation) | 5099445 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2012 R2 | 5099444 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2012 R2 (Server Core installation) | 5099444 (Monthly Rollup) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 | 5099535 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 (Server Core installation) | 5099535 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 | 5099538 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 (Server Core installation) | 5099538 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2022 | 5099540 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2025 | 5099536 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2025 (Server Core installation) | 5099536 (Security Update) |
Important | Remote Code Execution | Yes |
Patches
9 patches
| Article | Type | Restart |
|---|---|---|
5099535 |
Security Update | Yes |
5099538 |
Security Update | Yes |
5099539 |
Security Update | Yes |
5101650 |
Security Update | Yes |
5101649 |
Security Update | Yes |
5099445 |
Monthly Rollup | Yes |
5099444 |
Monthly Rollup | Yes |
5099540 |
Security Update | Yes |
5099536 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Quan Le from Unit 515 - OPSWAT
Saif Shaker
Peng Zhou (zpbrent)
Anindya Roy
Rayhan Destian
Rayhan Destian
Charlie Vogt
Michael Monwuba with Microsoft
MinhNV5 with MBBank
PuH4ck3rX
PuH4ck3rX
YMsora
Jishnu Sudhakaran
Ky0toFu
Povcfe
Daniel R
Anonymous
TrendAI Zero Day Initiative
References
On This Page