EUVD-2026-43990
GHSA-mvfj-xq2q-p2rj
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only race condition requiring an authenticated low-privileged foothold (AV:L/PR:L), unreliable timing window (AC:H), no user interaction, yielding full-impact privilege escalation (C/I/A:H).
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 component (Windows 10 1607 through Windows 11 26H1, and Windows Server 2016 through 2025) allows an authorized low-privileged attacker to win a race condition on an improperly synchronized shared resource and gain higher privileges. Exploitation is local-only and high-complexity because it depends on reliably hitting a narrow timing window, and no public exploit has been identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already have local, authenticated access with at least low privileges on the target (AV:L/PR:L) - this is not remotely reachable and requires no user interaction from a victim (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. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged but authenticated user (or malware already running in a low-integrity context) on a shared workstation or Remote Desktop server repeatedly triggers the vulnerable Windows App Store operation while concurrently manipulating the shared resource, racing to hit the narrow timing window. On a successful interleaving the privileged component acts on attacker-controlled state, yielding code execution or resource access at higher privilege. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49784, selecting the KB that matches your specific OS build (the update guide lists per-version fixed builds not included in this dataset). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and catalog all systems running affected Windows versions: Windows 10 (1607-26H1), Windows 11 (all versions), and Windows Server 2016-2025. …
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External POC / Exploit Code
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