EUVD-2026-56687
GHSA-hmq4-m8wx-rw8c
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low privilege required align with a standard user triggering DWM UAF; full C/I/A reflects SYSTEM-level code execution potential within the local scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Desktop Window Manager (DWM) Core Library via a use-after-free memory corruption flaw allows a locally authenticated, low-privileged attacker to achieve full SYSTEM-level code execution. Affected systems span Windows 10 21H2/22H2, Windows 11 23H2 through 26H1, Windows Server 2022, and Windows Server 2025 (including Server Core), representing a broad cross-section of the active Microsoft OS estate. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid local user account with at minimum standard (low-privilege) rights on the target system, consistent with CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a realistic and low-friction exploitation scenario: any standard domain or local user account is sufficient, no additional complexity or user interaction is required, and the outcome is full compromise of the vulnerable system. … 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 security update for CVE-2026-62888 via Windows Update, WSUS, or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, initiate patch availability assessment and create a prioritized deployment list for business-critical Windows 10 21H2/22H2, Windows 11 23H2-26H1, and Windows Server 2022/2025 systems; prepare testing environments. …
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
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