TI-2026-73043 Aliases CVE-2026-96303 GHSA-p862-mv9f-9294

Security feature bypass in Microsoft PowerShell

LOW 30CWE-358Published 2026-10-13 · Updated 2026-10-31

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Microsoft PowerShell 7.4 from 7.4.0 before 7.4.21, 7.5 from 7.5.0 before 7.5.12, and 7.6 from 7.6.0 before 7.6.8 contain an improperly implemented security check (CWE-358). An unauthenticated remote attacker can bypass a security feature if a user takes an action.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00691 53rd percentileScored 2026-11-07

Fix Fixed PowerShell 7.4 (Microsoft): 7.4.21PowerShell 7.5 (Microsoft): 7.5.12+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Microsoft	PowerShell 7.4	7.4.0 to before 7.4.21	7.4.21	Patch available	CNA
Microsoft	PowerShell 7.5	7.5.0 to before 7.5.12	7.5.12	Patch available	CNA
Microsoft	PowerShell 7.6	7.6.0 to before 7.6.8	7.6.8	Patch available	CNA

PowerShell 7.4 VendorMicrosoft Affected 7.4.0 to before 7.4.21 Fixed in 7.4.21 Patch available CNA
PowerShell 7.5 VendorMicrosoft Affected 7.5.0 to before 7.5.12 Fixed in 7.5.12 Patch available CNA
PowerShell 7.6 VendorMicrosoft Affected 7.6.0 to before 7.6.8 Fixed in 7.6.8 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:microsoft:powershell::::::::	7.4 to before 7.4.21; 7.5 to before 7.5.12; 7.6 to before 7.6.7	Vulnerable	Microsoft

cpe:2.3:a:microsoft:powershell:*:*:*:*:*:*:*:* Versions 7.4 to before 7.4.21; 7.5 to before 7.5.12; 7.6 to before 7.6.7 Vulnerable ·Microsoft

Remediation

Update PowerShell 7.4 to 7.4.21, PowerShell 7.5 to 7.5.12, and PowerShell 7.6 to 7.6.8.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA PowerShell 7.4 (Microsoft) Fixed in 7.4.21
Fix · CNA PowerShell 7.5 (Microsoft) Fixed in 7.5.12
Fix · CNA PowerShell 7.6 (Microsoft) Fixed in 7.6.8

Timeline

2026-10-13 Threatist record created from CVE-2026-96303
2026-10-13 Alias added: GHSA-p862-mv9f-9294
2026-10-14 CISA SSVC decision points changed
2026-10-14 Priority changed: MEDIUM → LOW
2026-10-23 Fix available: Microsoft/PowerShell [email protected] · CNA
2026-10-25 EPSS moved to the 50th–90th percentile

References

Patch 1

Microsoft PowerShell Security Feature Bypass Vulnerability

TI-2024-14152 .NET and Visual Studio Denial of Service Vulnerability CVSS 3.1HIGH 7.5
TI-2022-19606 PowerShell Remote Code Execution Vulnerability CVSS 3.1HIGH 8.5
TI-2018-06024 A remote code execution vulnerability exists in PowerShell Editor Services, aka… CVSS 3.1CRITICAL 9.8
TI-2024-00056 NET, .NET Framework, and Visual Studio Security Feature Bypass Vulnerability CVSS 3.1CRITICAL 9.8
TI-2022-07392 .NET and Visual Studio Denial of Service Vulnerability CVSS 3.1HIGH 7.5
TI-2024-17279 Microsoft QUIC Denial of Service Vulnerability CVSS 3.1HIGH 7.5

See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences