Local privilege escalation via incompatible resource type
Published Feb 10, 2026 · Updated Feb 10, 2026
Type confusion in Microsoft Desktop Window Manager allows local users on affected Windows releases to elevate privileges. Microsoft identifies incompatible-type resource access but has not disclosed the affected code path, object types, or triggering input. An attacker must already hold local low-privilege access; successful exploitation grants higher privileges, and CISA reports active exploitation.
Summary
What happened
Type confusion in Microsoft Desktop Window Manager allows local users on affected Windows releases to elevate privileges. Microsoft identifies incompatible-type resource access but has not disclosed the affected code path, object types, or triggering input. An attacker must already hold local low-privilege access; successful exploitation grants higher privileges, and CISA reports active exploitation.
The record
- CVE
- CVE-2026-21519
- Published
- Feb 10, 2026
- Updated
- Feb 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-843, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 10, 2026CVE publishedPublication date reported by the CVE source.
- Feb 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.8389
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities Catalog listingknown exploited catalog
Technologies
Your stack
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Your stack
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