EUVD-2026-56737
GHSA-638r-j524-9vfm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack vector and low-privilege requirement confirmed; heap overflow with full C/I/A impact consistent with SYSTEM privilege escalation from authenticated local user.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Message Queuing allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Message Queuing (MSMQ) allows a locally authenticated attacker to gain SYSTEM-level privileges via a heap-based buffer overflow. Affected systems are those running Windows with the Message Queuing service enabled. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authorized (locally authenticated) user account on the target Windows system - CVSS PR:L confirms low-privileged local access is sufficient and no elevated rights are needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H indicates local attack vector, low complexity, and low privilege requirement - meaning any authenticated local user can attempt exploitation without special configuration or user interaction. … 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 addressing CVE-2026-65790, available via Windows Update or the Microsoft Update Catalog; the exact patched version must be confirmed from the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65790. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a comprehensive audit to identify all Windows systems running Message Queuing service across the organization. …
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External POC / Exploit Code
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