Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Local low-privilege session required to trigger the use-after-free; scope change reflects crossing to SYSTEM privilege boundary; AC:L as complexity is low per description.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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
Privilege escalation in Windows Runtime (WinRT) via a use-after-free memory corruption flaw enables a locally authenticated low-privilege attacker to elevate to SYSTEM-level access on Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025. The CVSS scope change (S:C) confirms the exploit crosses a security boundary, yielding full confidentiality, integrity, and availability impact beyond the originating process. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a low-privilege local authenticated session on the affected system, consistent with CVSS PR:L - a standard domain or local user account is sufficient. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 rating with vector AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H reflects a locally exploitable, low-complexity vulnerability requiring only standard user privileges with no user interaction - yielding full CIA impact with a scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained a standard user session on a Windows 11 or Server 2025 host - via phishing, credential theft, or an initial access exploit - executes a crafted application that triggers the use-after-free condition in the Windows Runtime subsystem, manipulating freed heap memory to redirect execution and escalate privileges to SYSTEM. No public proof-of-concept code has been identified at time of analysis. … |
| Remediation | Apply the Microsoft-released patch referenced in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50413. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and enumerate all systems running Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 in your environment. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-43947
GHSA-qwj3-r4r6-v2cr