CVE-2026-21519

Description

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

Overview

State: PUBLISHED
Assigner (CNA): microsoft
CVSS severity: HIGH
CVSS score: 7.8 / 10
CVSS vector: 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
Effective score: 7.8 / 10 HIGH source: CNA overview
MSRC score: 7.8 / 10 HIGH MS rating: Important · Elevation of Privilege
CWE(s): CWE-843
Reserved: 2025-12-30
Published: 2026-02-10 08:00 UTC
Last updated: 2026-02-10 08:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21519.json
Linked Threat: CVE-2026-21519 — Microsoft Windows: Microsoft Windows Type Confusion Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Microsoft Windows Type Confusion Vulnerability
Vendor / project: Microsoft
Product: Windows
Date added to KEV: 2026-02-10
Remediation due: 2026-03-03
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.
Ransomware campaign use: Unknown
CISA notes: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21519 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21519
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-02-10 18:16:34 UTC
NVD last modified: 2026-02-11 16:13:16 UTC
NVD CVSS v3.1: 7.8 / 10 HIGH source: secure@microsoft.com
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 1.8 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.0407 (probability of exploitation in next 30 days)
EPSS percentile: 88.68% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-7358
Assigner: microsoft
Published: Feb 10, 2026, 5:51:13 PM
Updated: May 11, 2026, 9:25:13 PM
EUVD base score (CVSS 3.1): 7.8 / 10
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
EUVD-reported EPSS: 4.5200
Vendors: Microsoft
Products: Windows Server 2016 (10.0.14393.0 <10.0.14393.8868)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2025 (Server Core installation) (10.0.26100.0 <10.0.26100.32370)

Windows 11 Version 23H2 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2022, 23H2 Edition (Server Core installation) (10.0.25398.0 <10.0.25398.2149)

Windows 11 Version 25H2 (10.0.26200.0 <10.0.26200.7840)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows Server 2016 (10.0.14393.0 <10.0.14393.8868)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.8868)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.8868)

Windows 11 version 22H3 (10.0.22631.0 <10.0.22631.6649)

Windows Server 2025 (Server Core installation) (10.0.26100.0 <10.0.26100.32370)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.8868)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.6937)

Windows Server 2025 (10.0.26100.0 <10.0.26100.32370)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.8868)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

Windows Server 2022, 23H2 Edition (Server Core installation) (10.0.25398.0 <10.0.25398.2149)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.8389)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.8389)

Windows 11 version 26H1 (10.0.28000.0 <10.0.28000.1575)

Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows Server 2019 (10.0.17763.0 <10.0.17763.8389)

Windows 10 Version 21H2 (10.0.19044.0 <10.0.19044.6937)

Windows Server 2025 (10.0.26100.0 <10.0.26100.32370)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.8389)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.8389)

Windows Server 2022 (10.0.20348.0 <10.0.20348.4773)

Windows 11 Version 24H2 (10.0.26100.0 <10.0.26100.7840)
Aliases: GHSA-h77q-4hph-8vf3

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

EUVD references (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21519

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-07-15 03:05 UTC (source: CVRF).

MS severity: Important
Impact: Elevation of Privilege
MS CVSS base score: 7.8 / 10 (temporal 6.8)
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
Exploit assessment: Publicly Disclosed:No;Exploited:Yes;Latest Software Release:Exploitation Detected
Release: 2026-Feb

Microsoft remediations / KB articles (24)

5075904 — Vendor Fix / Security Update (fixed build 10.0.17763.8389)
https://support.microsoft.com/help/5075904 — None Available / 5075904
5075906 — Vendor Fix / Security Update (fixed build 10.0.20348.4773)
https://support.microsoft.com/help/5075906 — None Available / 5075906
5075943 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.20348.4711)
https://support.microsoft.com/help/5075943 — None Available / 5075943
5075912 — Vendor Fix / Security Update (fixed build 10.0.19044.6937)
https://support.microsoft.com/help/5075912 — None Available / 5075912
5075899 — Vendor Fix / Security Update (fixed build 10.0.26100.32370)
https://support.microsoft.com/help/5075899 — None Available / 5075899
5075942 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.26100.32313)
https://support.microsoft.com/help/5075942 — None Available / 5075942
5077181 — Vendor Fix / Security Update (fixed build 10.0.26200.7840)
https://support.microsoft.com/help/5077181 — None Available / 5077181
5077212 — Vendor Fix / Security Hotpatch Update (fixed build 10.0.26200.7781)
https://support.microsoft.com/help/5077212 — None Available / 5077212
5075941 — Vendor Fix / Security Update (fixed build 10.0.22631.6649)
https://support.microsoft.com/help/5075941 — None Available / 5075941
5075897 — Vendor Fix / Security Update (fixed build 10.0.25398.2149)
https://support.microsoft.com/help/5075897 — None Available / 5075897
5075999 — Vendor Fix / Security Update (fixed build 10.0.14393.8868)
https://support.microsoft.com/help/5075999 — None Available / 5075999
5077179 — Vendor Fix / Security Update (fixed build 10.0.28000.1575)
https://support.microsoft.com/help/5077179 — None Available / 5077179

Microsoft FAQ (1)

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Affected products (18)

Vendor	Product	Versions	Platforms
Microsoft	Windows 10 Version 1607	`10.0.14393.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 1809	`10.0.17763.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 21H2	`10.0.19044.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 10 Version 22H2	`10.0.19045.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 version 22H3	`10.0.22631.0` (affected)	ARM64-based Systems
Microsoft	Windows 11 Version 23H2	`10.0.22631.0` (affected)	x64-based Systems
Microsoft	Windows 11 Version 24H2	`10.0.26100.0` (affected)	ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 Version 25H2	`10.0.26200.0` (affected)	—
Microsoft	Windows 11 version 26H1	`10.0.28000.0` (affected)	ARM64-based Systems
Microsoft	Windows 11 Version 26H1	`10.0.28000.0` (affected)	—
Microsoft	Windows Server 2016	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2016 (Server Core installation)	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019 (Server Core installation)	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022	`10.0.20348.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	`10.0.25398.0` (affected)	x64-based Systems
Microsoft	Windows Server 2025	`10.0.26100.0` (affected)	x64-based Systems
Microsoft	Windows Server 2025 (Server Core installation)	`10.0.26100.0` (affected)	x64-based Systems

Affected products — CPE 2.3 (21) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

Desktop Window Manager Elevation of Privilege Vulnerability vendor-advisorypatch

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Desktop Window Manager Elevation of Privilege Vulnerability vendor-advisory, patch

Web references (24)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21519 secure@microsoft.com Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21519 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cve	`CVE-2026-21519`	no local data	2026-05-14 02:58 UTC
cwe	`CWE-843`	no local data	2026-05-14 02:58 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-21519: Windows 10 1607 Privilege Escalation Flaw - SentinelOne

web:www.sentinelone.com

CVE-2026-21519 is a privilege escalation vulnerability in Windows 10 1607. Learn about its impact, affected versions, and mitigation methods.

2026-05-14 16:50 UTC
Microsoft February 2026 Patch Tuesday Fixes 54 Vulnerabilities ...

web:cyberpress.org

Microsoft's February 2026 Patch Tuesday dropped with major urgency, fixing 54 security flaws across Windows, Office, Exchange, Azure, and more. The standout issue? Six zero-day vulnerabilities are already under active attack in the wild. These are bugs hackers exploited before Microsoft could patch them. IT teams must apply these updates now to avoid breaches. Zero-days let attackers slip ...

2026-05-14 16:50 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

web:cybersecuritynews.com

Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

2026-05-14 16:50 UTC
Nvd - Cve-2026-21519

web:nvd.nist.gov

Information Technology Laboratory National Vulnerability Database Vulnerabilities

2026-05-14 16:50 UTC
Feb 2026: Desktop Window Manager Elevation of Privilege Vulnerability

web:stack.watch

Known Exploited Vulnerability This Microsoft Windows Type Confusion Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Microsoft Desktop Windows Manager contains a type confusion vulnerability that could allow an authorized attacker to elevate privileges locally. The following remediation steps are recommended / required by March 3, 2026 : Apply mitigations per vendor ...

2026-05-14 16:50 UTC
Microsoft's May 2026 Patch Tuesday Fixes 130+ Vulnerabilities ...

web:windowsreport.com

Microsoft has released its May 2026 Patch Tuesday updates for Windows 11 and Windows 10, shipping as KB5089549 and KB5087544. The updates include fixes for more than 130 security vulnerabilities across Windows, Office, SharePoint, DNS components, and core system services, as Bleeping Computer writes. While no publicly disclosed zero-day vulnerabilities were reported this month, the […]

2026-05-14 16:50 UTC
Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days

web:www.bleepingcomputer.com

Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.

2026-05-14 16:50 UTC
CVE-2026-21519 - Vulnerability Details - OpenCVE

web:app.opencve.io

Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Download and install the Microsoft security update for CVE‑2026‑21519 from the MSRC link (https://msrc.microsoft.com/update-guide/vulnerability/ CVE - 2026 - 21519 ). This patch addresses the type‑confusion in DWM.

2026-05-14 16:50 UTC
CISA Required Action

CISA KEV

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due date: 2026-03-03 Known ransomware campaign use: Unknown

2026-05-14 01:13 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-21519.json.

{
  "containers": {
    "adp": [
      {
        "metrics": [
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                  },
                  {
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-11T04:55:58.482668Z",
                "version": "2.0.3"
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        "title": "CISA ADP Vulnrichment"
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          "product": "Windows Server 2019",
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          "product": "Windows Server 2022",
          "vendor": "Microsoft",
          "versions": [
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