EUVD-2026-73407
GHSA-8m5p-242c-cv48
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Vendor-stated AV:N is accepted given 'over a network' description; PR:L and UI:R reflect authenticated low-privilege session with interactive trigger; S:U since privesc stays within the compromised host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Heap-based buffer overflow in the Windows Win32K kernel graphics subsystem allows a low-privileged, authenticated remote attacker to elevate privileges to SYSTEM-level on affected Windows hosts. The flaw spans an exceptionally wide range of Microsoft Windows versions - from Server 2012 through Windows 11 26H1 and Server 2025 - making the potential blast radius substantial. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a low-privileged authenticated account on the target Windows system - this rules out fully unauthenticated remote attackers but is achievable with any standard domain or local user credential. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.0 (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H) score reflects a meaningful but bounded threat profile: exploitation requires a low-privileged authenticated session and a user-interaction trigger, reducing opportunistic risk compared to a fully unauthenticated, zero-click flaw. … 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 | The primary remediation is applying Microsoft's released patches via Windows Update or WSUS, targeting the specific build thresholds listed in the affected versions - for example, upgrading Windows Server 2025 to build 10.0.26100.33438 or later, and Windows 11 24H2 to 10.0.26100.9445 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and catalog all affected Windows Server (2012, 2016, 2019, 2022, 2025) and Windows 11 systems in your environment; obtain the latest Microsoft security patches from Windows Update or MSRC. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today