EUVD-2026-43900
GHSA-4ffp-3cf5-9hgm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local race-condition EoP from an existing low-privilege account (AV:L, PR:L), no user interaction, reliably triggerable (AC:L), yielding full SYSTEM-level CIA impact within unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/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 Operating Systems allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows (Windows 11 24H2/25H2/26H1 and Windows Server 2025) allows an authorized attacker to win a race condition on an improperly synchronized shared resource and elevate to higher privileges. Reported by Microsoft with a vendor patch available, there is no public exploit identified at time of analysis and the CVE 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 hold a valid low-privilege authenticated local session on the target (PR:L, AV:L) and the ability to execute code that repeatedly triggers the vulnerable shared-resource operation to hit the timing window (CWE-362 race condition). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H yields 7.8 (High): exploitation is local (AV:L), low complexity (AC:L), requires an existing low-privilege authenticated foothold (PR:L), needs no user interaction, and grants high impact across CIA within an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privilege account on a Windows 11 or Server 2025 host - for example a standard user on a shared terminal server or a foothold from a phishing payload - runs a small program that repeatedly triggers the vulnerable operation to hit the race-condition window. By winning the race on the improperly synchronized shared resource, the code manipulates the object mid-operation to gain SYSTEM-level privileges. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50317 to all affected Windows 11 (24H2/25H2/26H1) and Windows Server 2025 systems, including Server Core installations, using the KB and build numbers listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50317 (exact fixed build numbers were not in the provided data and must be taken from that page). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems across your organization, prioritizing production servers and systems handling sensitive data. …
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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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