EUVD-2026-43982
GHSA-8h23-vphm-42cr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an existing low-privileged account (AV:L, PR:L) with no user interaction and low complexity, yielding full SYSTEM-level compromise (C/I/A:H), scope unchanged.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Insufficient granularity of access control in Windows StateRepository API allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows StateRepository API lets an already-authenticated low-privileged user gain higher (typically SYSTEM-level) privileges due to insufficiently granular access control (CWE-1220). It affects a broad range of currently supported Windows client and server builds (Windows 10 1809 through Windows 11 26H1, and Windows Server 2019/2022/2025). The flaw was reported by Microsoft, a vendor patch is available, and there is no public exploit identified at time of analysis (not listed in CISA KEV).
Technical ContextAI
StateRepository is a core Windows Application Model component - a service-backed database (historically SQLite) that stores installation and configuration state for packaged apps (MSIX/UWP/AppX), package identity, and related deployment metadata, exposed through the StateRepository API. The root cause is CWE-1220, Insufficient Granularity of Access Control, meaning the API's authorization model does not distinguish sensitive operations or objects finely enough, so a caller with limited rights can reach actions or data that should require higher privilege. Because StateRepository runs as a privileged system service and mediates package state, weak access-control boundaries here translate directly into a local privilege-escalation primitive. The affected CPEs are all Microsoft Windows OS SKUs (client 10/11 and Server 2019/2022/2025, including Server Core installations), indicating the defect is in a shared OS component rather than a single edition.
RemediationAI
Patch available per vendor advisory - apply the Microsoft security update that addresses CVE-2026-49170 for your specific Windows build via Windows Update or WSUS/SCCM/Intune; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49170 for the exact KB and build numbers per SKU (no exact fix build number was provided in the input, so pull the precise KB from the MSRC page for your version). Because this is a local elevation-of-privilege issue with no known standalone workaround, the primary compensating control until patching is to limit who can run code locally: restrict interactive and remote-desktop logon rights on shared and terminal-server hosts, remove unnecessary local user accounts, and enforce least privilege so untrusted users cannot execute arbitrary processes - the trade-off is operational friction on multi-user systems and it does not fully close the vector. Monitor for anomalous StateRepository/AppX deployment activity as a detective control.
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External POC / Exploit Code
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