CVE-2026-96951
Microsoft Windows Command Injection Vulnerability
Microsoft Windows Shell contains a command injection vulnerability that allows an unauthorized attacker to bypass a security feature over a network.
CISA due Oct 16, 2026
- Microsoft Windows
- High
- CVSS 8.8
- EPSS 1.51%
- Fixed version listed
What to do
Fixed version listed
- Required action
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable.
- CISA deadline for US federal agencies
- Oct 16, 2026
Affected products
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Outlook.com | from 1.0.0, before 20260925.100 | 20260925.100 |
| Microsoft Windows 10 Version 1607 (32-bit Systems, x64-based Systems) | from 10.0.14393.0, before 10.0.14393.9612 | 10.0.14393.9612 |
| Microsoft Windows 10 Version 1809 (32-bit Systems, x64-based Systems) | from 10.0.17763.0, before 10.0.17763.9376 | 10.0.17763.9376 |
| Microsoft Windows 10 Version 21H2 (32-bit Systems, ARM64-based Systems, x64-based Systems) | from 10.0.19044.0, before 10.0.19044.7807 | 10.0.19044.7807 |
| Microsoft Windows 10 Version 22H2 (32-bit Systems, ARM64-based Systems, x64-based Systems) | from 10.0.19045.0, before 10.0.19045.7807 | 10.0.19045.7807 |
| Microsoft Windows 11 version 23H2 (ARM64-based Systems) | from 10.0.22631.0, before 10.0.22631.7652 | 10.0.22631.7652 |
| Microsoft Windows 11 Version 23H2 (x64-based Systems) | from 10.0.22631.0, before 10.0.22631.7652 | 10.0.22631.7652 |
| Microsoft Windows 11 Version 24H2 (ARM64-based Systems, x64-based Systems) | from 10.0.26100.0, before 10.0.26100.9711 | 10.0.26100.9711 |
| Microsoft Windows 11 Version 25H2 (ARM64-based Systems, x64-based Systems) | from 10.0.26200.0, before 10.0.26200.9711 | 10.0.26200.9711 |
| Microsoft Windows 11 version 26H1 (ARM64-based Systems, x64-based Systems) | from 10.0.28000.0, before 10.0.28000.3231 | 10.0.28000.3231 |
| Microsoft Windows 11 Version 26H2 (ARM64-based Systems, x64-based Systems) | from 10.0.26300.0, before 10.0.26300.9711 | 10.0.26300.9711 |
| Microsoft Windows Server 2012 R2 (x64-based Systems) | from 6.3.9600.0, before 6.3.9600.23470 | 6.3.9600.23470 |
| Microsoft Windows Server 2012 R2 (Server Core installation) (x64-based Systems) | from 6.3.9600.0, before 6.3.9600.23470 | 6.3.9600.23470 |
| Microsoft Windows Server 2016 (x64-based Systems) | from 10.0.14393.0, before 10.0.14393.9612 | 10.0.14393.9612 |
| Microsoft Windows Server 2016 (Server Core installation) (x64-based Systems) | from 10.0.14393.0, before 10.0.14393.9612 | 10.0.14393.9612 |
| Microsoft Windows Server 2019 (x64-based Systems) | from 10.0.17763.0, before 10.0.17763.9376 | 10.0.17763.9376 |
| Microsoft Windows Server 2019 (Server Core installation) (x64-based Systems) | from 10.0.17763.0, before 10.0.17763.9376 | 10.0.17763.9376 |
| Microsoft Windows Server 2022 (x64-based Systems) | from 10.0.20348.0, before 10.0.20348.5761 | 10.0.20348.5761 |
| Microsoft Windows Server 2025 (x64-based Systems) | from 10.0.26100.0, before 10.0.26100.33650 | 10.0.26100.33650 |
| Microsoft Windows Server 2025 (Server Core installation) (x64-based Systems) | from 10.0.26100.0, before 10.0.26100.33650 | 10.0.26100.33650 |
Advisories and fixes
- Vendor advisory msrc.microsoft.com
Scores and signals
- Exploitation
- Exploited in the wild
- Severity
- High, CVSS 8.8 (v3.1, scored by microsoft)
- EPSS
- 1.51% chance of exploitation in the next 30 days (EPSS from FIRST, as of Oct 23, 2026)
- CISA's SSVC decision points
- Exploitation: active. Automatable: no. Technical impact: total. As of Oct 8, 2026.
- Weakness
- CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
- Vendor
- Microsoft, Windows
Timeline
- Added to CISA's Known Exploited Vulnerabilities catalog: exploited in the wild. US federal agencies must remediate by 2026-10-16.