Patch tracker / CVE reference / CVE-2026-50406
CVE-2026-50406
CVE-2026-50406 is a high severity Microsoft vulnerability with a CVSS score of 7.0. Its EPSS score puts the probability of exploitation in the next 30 days at 64%. Microsoft has shipped the fix: deploy one of the 3 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 64%. CVSS 7.0 (High).
This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.
CVE-2026-50406 is an Elevation of Privilege flaw in the Windows Backup Engine on Windows 10 Version 21H2, rated High with a CVSS score of 7.0. Because it lives in the backup subsystem, an attacker who already has a foothold could abuse backup operations to gain higher privileges on 32-bit, ARM64, and x64 builds. It is not in the CISA KEV catalog and has no known ransomware association, so this is a patch-before-exploitation situation rather than active-fire.
Do this: Deploy the vendor patch to all Windows 10 Version 21H2 systems across 32-bit, ARM64, and x64 architectures, prioritizing servers running backup roles.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-50406
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-50406
High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5099539, 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-2026-50406. 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
- Fixed by the same updates
- Authoritative references
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