CVE-2026-96951: Windows Shell Security Feature Bypass Vulnerability
Improper neutralization of special elements used in a command ('command injection') in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
- Published by source
- 2026-10-13
- First seen by Reality Radar
- 2026-10-20
- Last verified
- 2026-10-27
Affected
- Manufacturer
- Microsoft
- Products
- Windows Server 2012 R2 Windows 10 Version 1607 Windows Server 2016 Windows 10 Version 1809 Windows Server 2019 Windows 10 Version 21H2 Windows 10 Version 22H2 Windows Server 2022 Windows 11 Version 23H2 Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H2 Windows Server 2025 Windows 11 Version 26H1 Windows 11 version 26H1 Outlook.com Microsoft Edge (Chromium-based)
- CPE
- cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.23470:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
Whether your exact unit is affected depends on the model, serial number and region in the official notice.
What the official notice says
Risk: Actively exploited — Important — Security Feature Bypass
Remedy / actions:
- Install the security update: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5126836
Is this affecting you?
Add what you own or use and Reality Radar will tell you when official changes match it — with evidence and next steps.
Sources
- CISA Known Exploited Vulnerabilities Tier A · official published 2026-10-13
- Microsoft Security Update Guide (MSRC) Tier A · official published 2026-10-13
Evidence ledger
Every piece of evidence we store is appended to a public hash chain, so later edits are detectable. Anyone can re-verify it.
| Entry | Kind | Observed | Evidence hash | Entry hash |
|---|---|---|---|---|
| #172 | corroboration | 2026-10-22 | 0e0c7f85cb5c…cfa9d2 | 31b89c0c2cc9…c9ee5e |
| #2307 | update | 2026-10-27 | 665dab2e4b22…1dbbcc | fa05d3b6e9e2…8c541d |
Chain head: #2378 f9a9faa3c245…7cbb39