Microsoft Windows Type Confusion Vulnerability

Are you affected?

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• cpe microsoft/windows 10 1607version unspecified
• cpe microsoft/windows 10 1809version unspecified
• cpe microsoft/windows 10 21h2version unspecified
• cpe microsoft/windows 10 22h2version unspecified
• vendor Microsoft Windowsversion unspecified

How to fix CVE-2026-21519

• Recommended remediation

  Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA due date Mar 3, 2026.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Technology hubs

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Feb 10, 2026 · Catalog

   Detected

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

2. Feb 10, 2026 · CISA KEV

   Known exploited

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

3. Mar 3, 2026 · CISA KEV

   Remediation due

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

4. Jun 17, 2026 · Catalog

   Updated

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

Sources

• CISA KEVConfirmed exploitationCVE-2026-21519

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

  cisa.gov
• CVE.orgVulnerability recordCVE-2026-21519

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-21519

  30-day exploitation probability 2.5%

  first.org
• NIST NVDVulnerability recordCVE-2026-21519

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

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2026-21519

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

  vulncheck.com

References

• VulnCheck exploitation evidence · api.msrc.microsoft.com
• VulnCheck exploitation evidence · docs.google.com
• CISA note · msrc.microsoft.com
• CISA note · nvd.nist.gov
• US Government Resource · cisa.gov
• VulnCheck exploitation evidence · cisa.gov
• VulnCheck exploitation evidence · recordedfuture.com

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.