Skip to content
Fencer Vulns
high 7.8

CVE-2026-21519 kev in the critical feed json

Desktop Window Manager Elevation of Privilege Vulnerability

published 2026-02-10 8 mo ago modified 2026-08-19 2 mo ago also EUVD-2026-7358

cvss
7.8
version 3.1, CNA
cisa kev
Exploited
added 2026-02-10
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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

Patch / fix

cisa required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  • Microsoft Windows 10 Version 1607 10.0.14393.8868
  • Microsoft Windows 10 Version 1809 10.0.17763.8389
  • Microsoft Windows 10 Version 21H2 10.0.19044.6937
  • Microsoft Windows 10 Version 22H2 10.0.19045.6937
  • Microsoft Windows 11 version 22H3 10.0.22631.6649
  • Microsoft Windows 11 Version 23H2 10.0.22631.6649
  • Microsoft Windows 11 Version 24H2 10.0.26100.7840
  • Microsoft Windows 11 Version 25H2 10.0.26200.7840
  • Microsoft Windows 11 version 26H1 10.0.28000.1575
  • Microsoft Windows Server 2016 10.0.14393.8868
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.8868
  • Microsoft Windows Server 2019 10.0.17763.8389
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.8389
  • Microsoft Windows Server 2022 10.0.20348.4773
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2149
  • Microsoft Windows Server 2025 10.0.26100.32370
  • Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.32370

Timeline

  1. 0-day patched (Project Zero)
  2. Added to CISA KEV
  3. Published
  4. CISA SSVC: exploitation active
  5. CISA patch deadline

Known exploited

Added
8 mo ago
Patch by
2026-03-03 (8 mo ago)
Ransomware
Not known
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor, product
Microsoft, Windows
CISA name
Microsoft Windows Type Confusion Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Patched
2026-02-10
Details
project zero tracker

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
8 mo ago

Exploit prediction

2.57% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Windows 10 Version 1607
  • Microsoft Windows 10 Version 1809
  • Microsoft Windows 10 Version 21H2
  • Microsoft Windows 10 Version 22H2
  • Microsoft Windows 11 version 22H3
  • Microsoft Windows 11 Version 23H2
  • Microsoft Windows 11 Version 24H2
  • Microsoft Windows 11 Version 25H2
  • Microsoft Windows 11 version 26H1
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
  • Microsoft Windows Server 2025
  • Microsoft Windows Server 2025 (Server Core installation)

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.