EUVD-2026-56729
GHSA-j5fx-7jrf-m8j9
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel LPE requiring authenticated standard user; AC:L reflects straightforward heap manipulation once foothold exists; full C/I/A from SYSTEM-level access achieved.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Win32K via a use-after-free memory corruption flaw enables a locally authenticated standard user to gain SYSTEM-level access across a broad range of Microsoft Windows desktop and server releases. The vulnerability resides in the win32k.sys kernel-mode driver and carries a CVSS 7.8 score with low attack complexity and no user interaction required once local code execution is established. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a locally authenticated account with at least standard user privileges, consistent with CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score reflects a locally exploitable privilege escalation with low attack complexity, low privilege requirement, no user interaction, and high CIA impact - a reliable and clean LPE profile. … 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 via Windows Update or the Microsoft Update Catalog, targeting the specific build thresholds per product: Windows 11 23H2 to build 10.0.22631.7517 or later, Windows 11 24H2/25H2 to 10.0.26100.9168 or later, Windows Server 2025 to 10.0.26100.33296 or later, Windows Server 2022 to 10.0.20348.5499 or later, Windows Server 2019 and Windows 10 1809 to 10.0.17763.9115 or later, Windows 10 21H2 to 10.0.19044.7663, Windows 10 22H2 to 10.0.19045.7663, Windows 10 1607 and Windows Server 2016 to 10.0.14393.9418 or later, Windows Server 2012 to 6.2.9200.26279 or later, and Windows Server 2012 R2 to 6.3.9600.23337 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, notify infrastructure and endpoint teams of CVE-2026-65775 and inventory all Windows desktop and server systems requiring patching. …
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External POC / Exploit Code
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