What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-31
• Weakness: CWE-358

Description

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

Affected products

• Microsoft Powershell: from 7.4 before 7.4.21; from 7.5 before 7.5.12; from 7.6 before 7.6.7 — fixed in 7.4.21, 7.5.12, 7.6.7
• Microsoft PowerShell 7.4: from 7.4.0 before 7.4.21 — fixed in 7.4.21
• Microsoft PowerShell 7.5: from 7.5.0 before 7.5.12 — fixed in 7.5.12
• Microsoft PowerShell 7.6: from 7.6.0 before 7.6.8 — fixed in 7.6.8

How to fix

Upgrade to a fixed version: Microsoft Powershell 7.4.21, 7.5.12, 7.6.7; Microsoft PowerShell 7.4 7.4.21; Microsoft PowerShell 7.5 7.5.12; Microsoft PowerShell 7.6 7.6.8. Check the vendor advisory for mitigations.

In the news

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

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96303

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