Windows
CVE-2026-21234
HIGH
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Connected Devices Platform Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Connected Devices Platform Service exploits a race condition in resource synchronization, allowing authenticated attackers to gain elevated privileges on affected Windows systems including Server 2022, Windows 11 25h2, and Windows 10 21h2. The vulnerability requires local access and user interaction is not needed, making it a practical attack vector for users with standard privileges. No patch is currently available.
Technical ContextAI
Classified as CWE-362 (Race Condition). Affects Windows 10 1809. Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Connected Devices Platform Service allows an authorized attacker to elevate privileges locally.
RemediationAI
Monitor vendor advisories for a patch.
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
Leaving vuln.today