CVE-2026-21519
HighExploitedPublic exploitDesktop Window Manager Elevation of Privilege Vulnerability
Published Feb 10, 2026 · Updated Aug 19, 2026
Key Facts
Patch immediately- CVE-2026-21519 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 10 1607 (Microsoft), Windows 10 1809 (Microsoft), windows 10 21H2 (Microsoft) and 22 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 10, 2026. Public exploit code is available.
- EPSS estimates a 2.5% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 1607 10.0.14393.8868, Windows 10 1809 10.0.17763.8389, windows 10 21H2 10.0.19044.6937.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
2.5%
Higher than 84.2% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-21519 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 10, 2026 | Mar 3, 2026 | Not reported |
| Industry KEV feed | Feb 10, 2026 | Mar 3, 2026 | Not reported |
| CIRCL KEV | Feb 10, 2026 | Mar 3, 2026 | Not reported |
| ENISA EUVD | Feb 10, 2026 | n/a | Not reported |
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.
Affected Products
70 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 1607Microsoft | 10.0.14393.8868 | 10.0.14393.8868 |
| Windows 10 1809Microsoft | 10.0.17763.8389 | 10.0.17763.8389 |
| windows 10 21H2Microsoft | 10.0.19044.6937 | 10.0.19044.6937 |
| windows 10 22H2Microsoft | 10.0.19045.6937 | 10.0.19045.6937 |
| windows 11 23H2Microsoft | 10.0.22631.6649 | 10.0.22631.6649 |
Patched Releases
Windows 10 1607
10.0.14393.8868
Windows 10 1809
10.0.17763.8389
windows 10 21H2
10.0.19044.6937
windows 10 22H2
10.0.19045.6937
windows 11 23H2
10.0.22631.6649
windows 11 24H2
10.0.26100.7781, 10.0.26100.7840
windows 11 25H2
10.0.26200.7781, 10.0.26200.7840
windows 11 26H1
10.0.28000.1575
Windows Server 2016
10.0.14393.8868
Windows Server 2019
10.0.17763.8389
Windows Server 2022
10.0.20348.4711, 10.0.20348.4773
Windows Server 2022 23h2
10.0.25398.2149
Windows Server 2025
10.0.26100.32313, 10.0.26100.32370
Windows Server 23h2
10.0.25398.2149
Windows 10 Version 1607
10.0.14393.8868
Windows 10 Version 1809
10.0.17763.8389
Windows 10 Version 21H2
10.0.19044.6937
Windows 10 Version 22H2
10.0.19045.6937
Windows 11 version 22H3
10.0.22631.6649
Windows 11 Version 23H2
10.0.22631.6649
Windows 11 Version 24H2
10.0.26100.7840
Windows 11 Version 25H2
10.0.26200.7840
Windows 11 version 26H1
10.0.28000.1575
Windows Server 2016 (Server Core installation)
10.0.14393.8868
Windows Server 2019 (Server Core installation)
10.0.17763.8389
Timeline
Publicly disclosed
Feb 10, 2026
Added to CISA KEV
Feb 10, 2026
Added to Industry KEV feed
Feb 10, 2026
Added to CIRCL KEV
Feb 10, 2026
Added to ENISA EUVD
Feb 10, 2026
Last updated
Aug 19, 2026
Weakness Type
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
References
FAQ
Common Questions.
Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
Affected: Windows 10 1607 (Microsoft) versions 10.0.14393.8868; Windows 10 1809 (Microsoft) versions 10.0.17763.8389; windows 10 21H2 (Microsoft) versions 10.0.19044.6937, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 10, 2026.
Yes. It was added on Feb 10, 2026 with a federal remediation due date of Mar 3, 2026.
Public exploit code is available.
Fixed versions are available, including Windows 10 1607 10.0.14393.8868, Windows 10 1809 10.0.17763.8389, windows 10 21H2 10.0.19044.6937.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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