EUVD-2026-43911
GHSA-8c98-2wcx-rg4c
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation requiring an existing low-privileged foothold (AV:L/PR:L); the use-after-free race gives AC:H; full SYSTEM compromise yields C:H/I:H/A:H with 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
Use after free in Windows Runtime allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Runtime (WinRT) affects a broad range of Windows client and server builds, from Windows 10 1809 through Windows 11 26H1 and Windows Server 2019 through 2025. An authorized local attacker who can run low-privileged code can trigger a use-after-free memory-corruption condition to elevate to higher privileges, with high confidentiality, integrity, and availability impact implying a path to SYSTEM. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated access with the ability to execute code at low privilege on the target (CVSS PR:L, AV:L) - this is a privilege-escalation primitive, not a remote entry point, so it presumes a prior foothold. … 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 | An attacker who has already gained a low-privileged foothold - for example through a phishing payload, a compromised service account, or a standard user login on a shared server - runs a crafted program that repeatedly manipulates a WinRT object to trigger the use-after-free and groom the freed memory. By winning the timing race and controlling the reallocated allocation, the attacker corrupts privileged state and elevates to SYSTEM. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50410 via Windows Update or WSUS/SCCM; the patched build corresponds to the cumulative update for your OS edition as listed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50410 (Patch available per vendor advisory - an exact fix build number was not provided in the input, so consult the MSRC page for the KB matching your version). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of Windows 10 (build 1809 or later), Windows 11, and Windows Server 2019-2025 systems across your enterprise. …
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External POC / Exploit Code
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