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CVE-2026-21519

Microsoft Windows Type Confusion Vulnerability

Microsoft WindowsOperating systems
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationExploited in the wildAdded to KEV 10 Feb 2026CISA KEV
Exploit odds (EPSS)2.48%Chance of exploitation activity in the next 30 days, higher than 84% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.14393.8868Also 10.0.17763.8389, 10.0.19044.6937 and 8 moreCVE List
Federal deadline3 Mar 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

  • 10.0.14393.8868Windows 10 Version 1607CVE List
  • 10.0.17763.8389Windows 10 Version 1809CVE List
  • 10.0.19044.6937Windows 10 Version 21H2CVE List
  • 10.0.19045.6937Windows 10 Version 22H2CVE List
  • 10.0.22631.6649Windows 11 version 22H3CVE List
  • 10.0.22631.6649Windows 11 Version 23H2CVE List
Show all 18 fixed versions
  • 10.0.26100.7840Windows 11 Version 24H2CVE List
  • 10.0.26200.7840Windows 11 Version 25H2CVE List
  • 10.0.28000.1575Windows 11 version 26H1CVE List
  • 10.0.28000.1575Windows 11 Version 26H1CVE List
  • 10.0.14393.8868Windows Server 2016CVE List
  • 10.0.14393.8868Windows Server 2016 (Server Core installation)CVE List
  • 10.0.17763.8389Windows Server 2019CVE List
  • 10.0.17763.8389Windows Server 2019 (Server Core installation)CVE List
  • 10.0.20348.4773Windows Server 2022CVE List
  • 10.0.25398.2149Windows Server 2022, 23H2 Edition (Server Core installation)CVE List
  • 10.0.26100.32370Windows Server 2025CVE List
  • 10.0.26100.32370Windows Server 2025 (Server Core installation)CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 10 Feb 2026Added to CISA KEVCISA KEV
  2. 10 Feb 2026, 17:51 UTCPublishedCVE List

Description

Microsoft Desktop Windows Manager contains a type confusion vulnerability that could allow an authorized attacker to elevate privileges locally.

Text from CVE List

Affected versions 18

  • Windows 10 Version 1607affected: 10.0.14393.0 before 10.0.14393.8868CVE List
  • Windows 10 Version 1809affected: 10.0.17763.0 before 10.0.17763.8389CVE List
  • Windows 10 Version 21H2affected: 10.0.19044.0 before 10.0.19044.6937CVE List
  • Windows 10 Version 22H2affected: 10.0.19045.0 before 10.0.19045.6937CVE List
  • Windows 11 version 22H3affected: 10.0.22631.0 before 10.0.22631.6649CVE List
  • Windows 11 Version 23H2affected: 10.0.22631.0 before 10.0.22631.6649CVE List
  • Windows 11 Version 24H2affected: 10.0.26100.0 before 10.0.26100.7840CVE List
  • Windows 11 Version 25H2affected: 10.0.26200.0 before 10.0.26200.7840CVE List
  • Windows 11 version 26H1affected: 10.0.28000.0 before 10.0.28000.1575CVE List
  • Windows 11 Version 26H1affected: 10.0.28000.0 before 10.0.28000.1575CVE List
  • Windows Server 2016affected: 10.0.14393.0 before 10.0.14393.8868CVE List
  • Windows Server 2016 (Server Core installation)affected: 10.0.14393.0 before 10.0.14393.8868CVE List
  • Windows Server 2019affected: 10.0.17763.0 before 10.0.17763.8389CVE List
  • Windows Server 2019 (Server Core installation)affected: 10.0.17763.0 before 10.0.17763.8389CVE List
  • Windows Server 2022affected: 10.0.20348.0 before 10.0.20348.4773CVE List
  • Windows Server 2022, 23H2 Edition (Server Core installation)affected: 10.0.25398.0 before 10.0.25398.2149CVE List
  • Windows Server 2025affected: 10.0.26100.0 before 10.0.26100.32370CVE List
  • Windows Server 2025 (Server Core installation)affected: 10.0.26100.0 before 10.0.26100.32370CVE List

References 3