EUVD-2026-43875
GHSA-2qjv-rvcr-g343
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation from an existing low-priv foothold (AV:L, PR:L) with no user interaction and low complexity, yielding full SYSTEM-level C/I/A impact.
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
Use after free in Windows Application Model allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Application Model (the subsystem underlying UWP/packaged app lifecycle and activation) lets an authorized attacker with an existing low-privileged foothold gain SYSTEM-level control by triggering a use-after-free memory-corruption condition. All supported Windows client and server builds from Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through Server 2025 are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess local, authenticated access with low privileges (CVSS PR:L) and the ability to run code that reaches the Windows Application Model component - i.e. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.8, High) describes a locally-exploitable, low-complexity flaw requiring only low existing privileges and no user interaction, with full confidentiality, integrity and availability impact - a classic reliable local EoP profile. … 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 phishing payload running in a standard user context or an untrusted user on a shared RDP session host - invokes the vulnerable Windows Application Model code path to trigger the use-after-free, grooms the heap to control the freed object, and elevates to SYSTEM to disable security tooling and install persistence. No user interaction is required and attack complexity is low, making exploitation reliable once a working technique exists, though no public POC is identified at time of analysis. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for your specific Windows SKU as published in the MSRC guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50331, which lists the exact fixed KB/build per version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and enumerate all Windows 10 (build 1607 and later), Windows 11, and Windows Server 2016-2025 systems in production and development environments to establish exposure scope. …
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External POC / Exploit Code
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