EUVD-2026-43977
GHSA-44xc-xw9f-mjr5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Local authenticated access with no user interaction gives AV:L/AC:L/PR:L/UI:N; description is disclosure-only, so C:H with I:N and A:N, diverging from the input's I:H.
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:N
Lifecycle Timeline
2DescriptionCVE.org
Use of uninitialized resource in Microsoft Windows App Store allows an authorized attacker to disclose information locally.
AnalysisAI
Local information disclosure in the Microsoft Windows App Store (Store/AppX component) affects a broad range of Windows 10, Windows 11, and Windows Server releases (1607 through 26H1, Server 2016/2019/2022/2025). An authorized local attacker can leverage a use of uninitialized resource (CWE-908) to read memory contents that should not be exposed, with CVSS 7.1 reflecting high confidentiality impact but requiring low-privileged authenticated local access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold an authenticated local foothold on the affected host (CVSS PR:L, AV:L) - there is no remote or network path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N, base 7.1) indicates a locally-exploitable flaw requiring low privileges and no user interaction, which is realistic for an inbox Store component that any authenticated user can invoke. … 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 workstation or Remote Desktop server invokes the vulnerable Store/AppX code path, causing it to operate on an uninitialized buffer and return leftover memory contents. The attacker reads sensitive residual data - potentially credentials, tokens, or pointers useful for defeating ASLR - and uses it to advance a broader local privilege-escalation chain. … |
| Remediation | Apply the Microsoft security update for CVE-2026-49165 as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49165 - Patch available per vendor advisory; the exact fixed KB/build numbers are enumerated per Windows release in that advisory and should be sourced there rather than assumed, since fixes are delivered as cumulative monthly updates. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, begin inventory of all Windows 10, Windows 11, and Windows Server (2016, 2019, 2022, 2025) systems in your environment to identify patch scope. …
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Same weakness CWE-908 – Use of Uninitialized Resource
View allSame technique Information Disclosure
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External POC / Exploit Code
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