EUVD-2026-43894
GHSA-q4pv-ph9w-px5v
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
AC:H because success hinges on winning a timing race; PR:N/UI:N per unauthorized network trigger; availability-dominant (A:H) with limited C/I, consistent with an EoP race in a shared OS component.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an unauthorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in the Windows Runtime (WinRT) allows a network-based, unauthenticated attacker to win a race condition and gain elevated privileges on affected Windows 10, Windows 11 (through 26H1), and Windows Server 2019-2025 systems. Microsoft self-reported the flaw and has shipped a fix; 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 reliably win a race condition (CWE-362) in the Windows Runtime - the CVSS AC:H metric explicitly reflects that success depends on hitting a narrow, timing-dependent synchronization window, which is the concrete limiting factor here and typically demands repeated attempts under favorable conditions. … 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:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H - network reachable and requiring no privileges or user interaction, but with High attack complexity because the attacker must reliably win a timing race, and impact skewed toward availability (A:H) with only Low confidentiality and integrity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network reachability to a vulnerable Windows host repeatedly triggers concurrent WinRT operations to hit the narrow synchronization window, bypassing an authorization check and executing a privileged action as an unauthorized user. Because attack complexity is High, the attacker likely needs many attempts and precise timing to win the race, and the primary observed effect is high impact to availability with lesser impact to confidentiality and integrity. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50348 to all affected Windows 10, Windows 11, and Windows Server systems; exact KB and build numbers are enumerated in the MSRC guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50348. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all Windows 10, Windows 11 (versions through 26H1), and Windows Server 2019-2025 systems and assess patch deployment readiness across your environment. …
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External POC / Exploit Code
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