EUVD-2026-73617
GHSA-6w99-p72w-9mc6
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L because exploitation requires local session access; AC:H for race-condition/heap-shaping requirement; PR:L per 'authorized attacker'; full C/I/A reflecting SYSTEM-level kernel compromise.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via use-after-free in the Win32K kernel subsystem affects multiple Windows 11 and Windows Server 2025 builds, allowing a locally authenticated low-privileged attacker to achieve full SYSTEM-level access. Affected builds span Windows 11 versions 24H2, 25H2, and 26H1, as well as Windows Server 2025 including its Server Core variant. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must possess a valid local user account on the target system - this is confirmed by the CVSS PR:L metric and the description's 'authorized attacker' language. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 base score reflects the realistic exploitation bar: AV:L constrains the attacker to local access, PR:L requires a valid authenticated account, and AC:H acknowledges the timing or heap-layout precision demanded by a race-condition use-after-free. … 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-released cumulative update via Windows Update or WSUS to advance Windows Server 2025 (and Server Core) to build 10.0.26100.33438 or later, Windows 11 24H2 and 25H2 to build 10.0.26100.9445 or 10.0.26200.9445 respectively, and Windows 11 26H1 to build 10.0.28000.2954 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025 systems in your environment, prioritizing business-critical infrastructure, RDP-accessible systems, and multi-user machines where lateral-movement risk is highest. …
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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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