CVE-2026-50406 — Security Box Score

CVE · referencelatest edition

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.

CVE-2026-50406HIGH

Microsoft Windows 10 Version 21H2 — Windows Backup Engine Elevation of Privilege Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  H  H  H    7.8   .0026   17.9     —

AFFECTED
  Product                  Versions        Fixed
  Windows 10 Version 21H2  10.0.19044.0 –  —
  Windows 10 Version 22H2  10.0.19045.0 –  —
  Windows 11 Version 24H2  10.0.26100.0 –  —
  Windows 11 Version 25H2  10.0.26200.0 –  —
  Windows 11 version 26H1  10.0.28000.0 –  —

TIMELINE
  Jun 4   Reserved by microsoft
  Jul 14  Published (CNA: microsoft)
  Jul 23  RESCORED — CVE-2026-50406 (Microsoft Windows 10 Version 21H2). CVSS 7 → 7.8 (NVD).

CWE-416 · CNA: microsoft · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

Use after free in Windows Backup Engine allows an authorized attacker to elevate privileges locally.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 4, 2026	Reserved	Reserved by microsoft
July 14, 2026	Published	Published (CNA: microsoft)
July 23, 2026	RESCORED	RESCORED — CVE-2026-50406 (Microsoft Windows 10 Version 21H2). CVSS 7 → 7.8 (NVD).

Affected

Affected products and packages — 5 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 10 Version 21H2	—	10.0.19044.0	—
Microsoft	Windows 10 Version 22H2	—	10.0.19045.0	—
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	—

Weaknesses

CWE-416

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50406 [vendor-advisory, patch]

Authoritative record: CVE-2026-50406 at cve.org

Vendors: microsoft

Weaknesses: CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-50406 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.