Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local post-compromise EoP: AV:L and PR:L reflect an existing low-priv foothold, AC:L as the race is low-complexity to win, full C:H/I:H/A:H from SYSTEM-level escalation.
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 Runtime allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Runtime (WinRT) across Windows 10, Windows 11, and Windows Server 2019 through 2025 allows an already-authenticated attacker to win a race condition and gain SYSTEM-level privileges. The flaw stems from concurrent access to a shared resource without proper synchronization, and full C:H/I:H/A:H impact indicates complete host compromise once triggered. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated access with low privileges on the target (CVSS AV:L, PR:L, UI:N) - this is strictly a post-compromise privilege-escalation bug, not remotely reachable. … 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 requires local access and low existing privileges but no user interaction, and race conditions of this class are typically low-complexity to win with repeated attempts despite the inherent timing dependency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged code execution on a Windows host - for example via a compromised standard user account or an exploited low-integrity service - runs a small program that repeatedly races a WinRT shared-resource operation to hit the unsynchronized TOCTOU window. On a successful race the attacker manipulates the shared state to execute code or alter data in a higher-privileged context, escalating from a standard user to SYSTEM. … |
| Remediation | Apply the Microsoft security update for CVE-2026-54125 as delivered through the monthly cumulative update for each affected Windows and Windows Server build (Patch available per vendor advisory); consult the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54125 to obtain the exact KB and patched build for your specific version, as the input does not enumerate a single fix version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and catalog all Windows 10, 11, and Server 2019-2025 systems in your environment and rank by business criticality. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44146
GHSA-5qf9-5c2h-vxx7