EUVD-2026-44056
GHSA-948w-pp9c-f274
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only use-after-free EoP needing an existing low-privileged foothold (AV:L, PR:L), easily triggered with no user interaction (AC:L, UI:N), yielding full SYSTEM compromise (C/I/A: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:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Runtime allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Runtime (WinRT) component of Windows 10, Windows 11, and Windows Server allows an authenticated attacker to run arbitrary code with elevated (SYSTEM-level) privileges by triggering a use-after-free memory-corruption condition (CWE-416). Microsoft has released a patch, but there is no public exploit identified at time of analysis and the flaw is not listed in CISA KEV. …
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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 at least low privileges on the target (CVSS PR:L, AV:L) and the ability to execute code that reaches the vulnerable Windows Runtime code path; no user interaction is needed (UI:N) and attack complexity is low (AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (7.8 High) describes a locally exploitable flaw with low attack complexity, requiring low existing privileges and no user interaction, yielding high confidentiality, integrity, and availability impact within an unchanged scope. … 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 or a compromised standard user account - invokes the vulnerable Windows Runtime code path to trigger the use-after-free, grooms the heap to reclaim the freed object, and hijacks execution to run code as SYSTEM. No user interaction is required, and no public exploit is identified at time of analysis, so successful exploitation depends on the attacker developing or acquiring a working technique. |
| Remediation | Apply the Microsoft security update for CVE-2026-50457 for your specific Windows or Windows Server build; the fix is distributed through the standard monthly cumulative update, and exact patched build numbers are listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50457 (Patch available per vendor advisory). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and enumerate all Windows 10, 11, and Server systems across production and critical infrastructure, documenting baseline patch levels using Windows Update or WSUS reporting. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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