Patch tracker / CVE reference / CVE-2026-50668
CVE-2026-50668
CVE-2026-50668 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 6.8 (Medium). Microsoft has shipped the fix: deploy one of the 7 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
Risk summary
Not in the CISA KEV catalog. EPSS exploit probability 4.9%. CVSS 6.8 (Medium).
This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.
This is an elevation of privilege flaw in the Resilient File System (ReFS) driver, meaning it requires an attacker who can already run code on the box to gain higher privileges, which is why the CVSS lands at Medium (6.8) rather than critical. Exposure is narrow: Windows 10 Version 1809 (32-bit and x64) and Windows Server 2019, and it only matters where ReFS volumes are actually mounted or in use. It is not in CISA KEV and has no known ransomware use, so this is a patch-on-schedule item rather than a drop-everything one.
Do this: Apply the latest cumulative update to your Windows 10 1809 and Server 2019 systems, prioritizing hosts that mount ReFS volumes such as Storage Spaces or backup targets.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-50668
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-50668
Lower priority: patch in your normal cycle. In Intune or Defender, confirm whether the fixing updates KB5099535, KB5099536, KB5099538, KB5099539, KB5099540, KB5101649, KB5101650 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.
Apply the Microsoft security updates below to fix CVE-2026-50668. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.
Scope and sources
- Affected products
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016 (Server Core installation)
- Windows 10 Version 1607 for 32-bit Systems
- Windows 10 Version 1607 for x64-based Systems
- Windows 10 Version 1809 for 32-bit Systems
- Windows 10 Version 1809 for x64-based Systems
- Windows 10 Version 21H2 for 32-bit Systems
- Windows 10 Version 21H2 for ARM64-based Systems
- Windows 10 Version 21H2 for x64-based Systems
- Windows 10 Version 22H2 for 32-bit Systems
- Windows 10 Version 22H2 for ARM64-based Systems
- Windows 10 Version 22H2 for x64-based Systems
- Windows 11 Version 24H2 for ARM64-based Systems
- Windows 11 Version 24H2 for x64-based Systems
- Windows 11 Version 25H2 for ARM64-based Systems
- Windows 11 Version 25H2 for x64-based Systems
- Windows 11 Version 26H1 for ARM64-based Systems
- Windows 11 version 26H1 for x64-based Systems
- Windows Server 2016
- Windows Server 2016 (Server Core installation)
- Windows Server 2019
- Windows Server 2019 (Server Core installation)
- Windows Server 2022
- Windows Server 2022 (Server Core installation)
- Windows Server 2025
- Windows Server 2025 (Server Core installation)
- Fixed by the same updates
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.