EUVD-2026-56730
GHSA-jwv6-9x6m-f8v9
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low privilege confirmed by description; AC:H reflects UAF race-condition requirement; full C/I/A reflects attainable SYSTEM-level kernel control.
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
3DescriptionCVE.org
Use after free in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via use-after-free in Windows Win32K (win32k.sys) affects Windows 11 versions 24H2, 25H2, and 26H1, as well as Windows Server 2025 in both full and Server Core installations. An authenticated local attacker exploiting CWE-416 memory corruption in the Win32K kernel subsystem can elevate from low-privileged user to SYSTEM-level access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user session with at least low-privilege access (PR:L per CVSS vector), confirming that attackers must already have code execution on the target system under a standard user account. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.0 reflects local exploitation (AV:L) with high attack complexity (AC:H) and low required privileges (PR:L), meaningfully constraining the threat surface compared to a remote or unauthenticated vector. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security update that brings affected systems to the following patched builds: Windows 11 24H2 to 10.0.26100.9168 or later, Windows 11 25H2 to 10.0.26200.9168 or later, Windows 11 26H1 to 10.0.28000.2704 or later, and Windows Server 2025 (full and Server Core) to 10.0.26100.33296 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025 systems to identify scope. …
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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
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