EUVD-2026-43840
GHSA-7c82-69f2-m6j7
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only access with a pre-existing low-privileged account (AV:L, PR:L); winning the race is timing-dependent (AC:H); successful EoP yields full local C/I/A impact within an 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 Microsoft Windows App Store allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows App Store (AppX/package deployment component) allows an authorized, low-privileged user to win a race condition and gain higher privileges on affected Windows client and server builds spanning Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025. Exploitation requires local access and already-held low privileges, and the high attack complexity reflects the timing precision needed to win the race. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the attacker to already have a local, authenticated foothold with low privileges (PR:L) on the target Windows system and the ability to run code there - remote or unauthenticated exploitation is not possible (AV:L, UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are consistent and point to a genuine but not top-tier priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged but authenticated user on a shared Windows host (for example a terminal/RDS server or a workstation with standard user accounts) runs a purpose-built process that repeatedly triggers an AppX/Store deployment operation while racing to swap a shared resource in the validation-to-use window. On a successful race, their code executes with elevated privileges, giving full control of the machine. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50356 (Patch available per vendor advisory) to all affected Windows 10, Windows 11, and Windows Server systems; the exact patched build for each edition is listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50356. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (versions 1607 and later), Windows 11, and Windows Server 2016-2025 systems using your asset discovery tools. …
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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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