Windows CVE-2026-21508
HIGHCVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Improper authentication in Windows Storage allows an authorized attacker to elevate privileges locally.
AnalysisAI
Windows Storage component contains an authentication bypass that enables authenticated local users to escalate privileges on Windows 10, Windows 11, and Windows Server 2016/2019 systems. An attacker with valid local credentials can exploit this vulnerability to gain elevated system access without user interaction. …
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RemediationAI
Within 24 hours: Inventory all Windows systems running affected Storage components and assess user access patterns. Within 7 days: Implement access controls to restrict local administrative capabilities and review privileged account usage logs for suspicious activity. …
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