EUVD-2026-56642
GHSA-352w-hccj-h98p
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack vector requiring a low-privileged session; out-of-bounds read in the kernel yields full C/I/A impact via privilege escalation with no scope change beyond the local system.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via an out-of-bounds read in the Windows Win32K kernel subsystem allows a local authenticated attacker to gain SYSTEM-level access across a broad range of Windows client and server versions. The CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N) reflects a low-complexity local attack with full C/I/A impact, meaning any low-privileged user or compromised process can exploit this to completely own the host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing low-privileged local session on the affected Windows system - either via interactive console logon, Remote Desktop (RDP), or any mechanism granting local code execution (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score is consistent with a realistic local privilege escalation: AV:L confirms the attacker must already have local code execution, AC:L indicates no race conditions or special environment requirements, and PR:L means only a standard user account is needed - a typical foothold for any post-exploitation scenario. … 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 vendor-released patches via Windows Update or WSUS as documented in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62733. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running affected Windows versions (Server 2012-2022, Windows 7-11, Windows 11 26H1) and assess deployment density in RDP-heavy environments; escalate patch approval if terminal server or shared access systems are present. …
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External POC / Exploit Code
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