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Severity by source

Vendor (microsoft) PRIMARY
HIGH
qualitative
NVD
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
6.8 MEDIUM
cvss
vuln.today AI
7.8 HIGH

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.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 21:09 vuln.today
CVE Published
Jul 14, 2026 - 17:07 nvd
HIGH 7.8

DescriptionNVD

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

Access
Obtain low-priv local account
Delivery
Invoke Windows Key Guard code path
Exploit
Race unsynchronized shared resource
Execution
Win time-of-check/use window
Impact
Elevate to higher privileges

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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CVE-2026-50378 vulnerability details – vuln.today

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