EUVD-2026-56387
GHSA-mqr9-rmf4-cr4m
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local attack vector and low privilege required align with Win32K syscall access; confidentiality-only impact reflects kernel memory read with no write or crash capability.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Untrusted pointer dereference in Windows Win32K allows an authorized attacker to disclose information locally.
AnalysisAI
Windows Win32K contains an untrusted pointer dereference (CWE-822) that allows a locally authenticated attacker to disclose sensitive kernel or process memory contents. Affected systems include multiple Windows 11 release branches (23H2, 24H2, 25H2, 26H1) and Windows Server 2025, both full and Server Core installations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session on an affected Windows 11 or Windows Server 2025 system - the CVSS vector specifies PR:L (low-privileged account), meaning a standard user account (non-administrative) is sufficient. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) scores 5.5 and accurately reflects the local, low-privilege attack posture with high confidentiality impact and no integrity or availability consequence. … 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 released for this vulnerability, available via Windows Update, WSUS, or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-822 – Untrusted Pointer Dereference
View allSame technique Information Disclosure
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External POC / Exploit Code
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