Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated attacker (AV:L, PR:L) exploits a low-complexity race with no user interaction to achieve full local privilege escalation, giving high C/I/A within an unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Key Guard allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Key Guard affecting Windows 10 (1809/21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2019/2022/2025 allows an already-authenticated local attacker to win a race condition (CWE-362) and gain higher privileges. Reported by Microsoft with a patch now available; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess valid low-privilege local access to the target (CVSS PR:L, AV:L) - this is not remotely reachable and needs an existing authenticated foothold. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.8) describes a locally exploitable flaw requiring low existing privileges and no user interaction, yielding high impact across confidentiality, integrity, and availability within an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds a low-privileged local account on a Windows host (for example after phishing a standard user or via an unprivileged service) runs a purpose-built tool that repeatedly triggers the Key Guard code path, racing two threads to hit the unsynchronized window and corrupt shared state. Winning the race grants elevated privileges (up to SYSTEM-level control implied by C:H/I:H/A:H), enabling the attacker to install tooling, access protected data, or disable defenses. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50378 via Windows Update or WSUS/Intune; the patch is available per vendor (Patch available per vendor advisory) and the specific fixed KB/build numbers for each affected SKU are listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50378. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (versions 1809, 21H2, 22H2), Windows 11 (versions 24H2, 25H2, 26H1), and Windows Server 2019/2022/2025 systems and assess business-critical assets requiring protection. …
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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
EUVD-2026-43925
GHSA-p52g-fgpm-gpx8