Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Microsoft Windows 11 Version 24H2 — Windows Hyper-V Elevation of Privilege Vulnerability
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L N N U H H H 8.4 .0024 15.6 —
AFFECTED
Product Versions Fixed
Windows 11 Version 24H2 10.0.26100.0 – —
Windows 11 Version 25H2 10.0.26200.0 – —
Windows 11 version 26H1 10.0.28000.0 – —
Windows Server 2022 10.0.20348.0 – —
Windows Server 2025 10.0.26100.0 – —
Windows Server 2025 (Server Core installation) 10.0.26100.0 – —
TIMELINE
Jun 11 Reserved by microsoft
Jul 14 Published (CNA: microsoft)
Jul 22 RESCORED — CVE-2026-54127 (Microsoft Windows 11 Version 24H2). CVSS 7.4 → 8.4 (NVD).
Description
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| June 11, 2026 | Reserved | Reserved by microsoft |
| July 14, 2026 | Published | Published (CNA: microsoft) |
| July 22, 2026 | RESCORED | RESCORED — CVE-2026-54127 (Microsoft Windows 11 Version 24H2). CVSS 7.4 → 8.4 (NVD). |
Affected
Affected products and packages — 6 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Microsoft | Windows 11 Version 24H2 | — | 10.0.26100.0 | — |
| Microsoft | Windows 11 Version 25H2 | — | 10.0.26200.0 | — |
| Microsoft | Windows 11 version 26H1 | — | 10.0.28000.0 | — |
| Microsoft | Windows Server 2022 | — | 10.0.20348.0 | — |
| Microsoft | Windows Server 2025 | — | 10.0.26100.0 | — |
| Microsoft | Windows Server 2025 (Server Core installation) | — | 10.0.26100.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-54127 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.