CVE-2026-21519 — 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-2026-21519HIGH

Microsoft Windows 10 Version 1607 — Desktop Window Manager 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   .0242   82.9   YES

AFFECTED
  Product                  Versions        Fixed
  Windows 10 Version 1607  10.0.14393.0 –  —
  Windows 10 Version 1809  10.0.17763.0 –  —
  Windows 10 Version 21H2  10.0.19044.0 –  —
  Windows 10 Version 22H2  10.0.19045.0 –  —
  Windows 11 version 22H3  10.0.22631.0 –  —
  Windows 11 Version 23H2  10.0.22631.0 –  —
  Windows 11 Version 24H2  10.0.26100.0 –  —
  Windows 11 Version 25H2  10.0.26200.0 –  —
  Windows 11 version 26H1  10.0.28000.0 –  —
  Windows 11 Version 26H1  10.0.28000.0 –  —
  + 8 more

TIMELINE
  Dec 30  Reserved by microsoft
  Feb 10  Added to CISA KEV, remediation due 2026-03-03
  Feb 10  Published (CNA: microsoft)

CWE-843 · CNA: microsoft · CVSS v3.1 · 2 references · KEV due March 3, 2026

Description

Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 30, 2025	Reserved	Reserved by microsoft
February 10, 2026	KEV ADDED	Added to CISA KEV, remediation due 2026-03-03
February 10, 2026	Published	Published (CNA: microsoft)

Affected

Affected products and packages — 18 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 10 Version 1607	—	10.0.14393.0	—
Microsoft	Windows 10 Version 1809	—	10.0.17763.0	—
Microsoft	Windows 10 Version 21H2	—	10.0.19044.0	—
Microsoft	Windows 10 Version 22H2	—	10.0.19045.0	—
Microsoft	Windows 11 version 22H3	—	10.0.22631.0	—
Microsoft	Windows 11 Version 23H2	—	10.0.22631.0	—
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	—
Microsoft	Windows 11 Version 26H1	—	10.0.28000.0	—
Microsoft	Windows Server 2016	—	10.0.14393.0	—
Microsoft	Windows Server 2016 (Server Core installation)	—	10.0.14393.0	—
Microsoft	Windows Server 2019	—	10.0.17763.0	—
Microsoft	Windows Server 2019 (Server Core installation)	—	10.0.17763.0	—
Microsoft	Windows Server 2022	—	10.0.20348.0	—
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	—	10.0.25398.0	—
Microsoft	Windows Server 2025	—	10.0.26100.0	—
Microsoft	Windows Server 2025 (Server Core installation)	—	10.0.26100.0	—

Weaknesses

CWE-843

References (2)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21519 [vendor-advisory, patch]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21519 [government-resource]

Authoritative record: CVE-2026-21519 at cve.org

Vendors: microsoft

Weaknesses: CWE-843

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-21519 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.