EUVD-2026-56441
GHSA-p97c-j698-r6jp
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector with low-privilege requirement reflects an authenticated local user triggering a heap overflow in a privileged Windows service; unchanged scope as exploitation is contained to the vulnerable host with no cross-boundary impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Desktop Window Manager (DWM) allows a low-privileged local attacker to exploit a heap-based buffer overflow and obtain SYSTEM-level access. The vulnerability affects all modern Windows systems where DWM is running - its default state on any graphical Windows installation - and requires no user interaction once the attacker has local code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold a valid low-privileged local user account on the target Windows system (PR:L per CVSS vector) and the ability to execute code locally - this may be an interactive desktop session, a Remote Desktop Protocol session, or a local service account context. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS score of 7.8 (High) is well-calibrated to the vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H: this is a stable, no-interaction local privilege escalation requiring only a standard user account. … 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 for CVE-2026-65786 via Windows Update or by consulting the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65786 to identify the applicable KB article for the installed Windows version; the exact patched build number was not present in the available intelligence and must be confirmed from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and catalog all Windows systems with graphical interfaces and assess exposure to local account compromise based on current access policies. …
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External POC / Exploit Code
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