EUVD-2026-43895
GHSA-mfrp-f2w3-cjvx
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with an existing low-privileged account (AV:L/PR:L), a non-deterministic race window drives AC:H, and privilege elevation yields full C:H/I:H/A:H with unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Runtime (WinRT) component of Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 allows an authenticated local attacker to win a race condition and gain higher privileges. The flaw stems from improper synchronization of a shared resource (CWE-362); successful exploitation yields high confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have authenticated local access with low privileges (PR:L) and the ability to execute code on the target Windows 11 24H2/25H2/26H1 or Windows Server 2025 host; it cannot be triggered remotely or by an unauthenticated user (AV:L, UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.0 (High) with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - exploitation requires local access and existing low-level privileges, and the AC:H metric reflects that winning the race is timing-dependent and not reliably reproducible on demand. … 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 or has landed low-integrity code (e.g., via phishing or an initial-access exploit) runs a tool that repeatedly triggers the vulnerable WinRT code path while racing a second thread to manipulate the shared resource during the timing window. On a successful race they corrupt privileged state and elevate to higher privileges on the host. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50345 to all affected Windows 11 24H2/25H2/26H1 and Windows Server 2025 (including Server Core) systems via the monthly cumulative update; the fixed build numbers are listed in the MSRC guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50345. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enumerate all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems and verify current patch status against Microsoft's latest security updates for CVE-2026-50345. …
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
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