EUVD-2026-56637
GHSA-cj6m-jhjg-j389
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 align with MSMQ service access from an authenticated local session; full CIA impact reflects SYSTEM-level privilege escalation outcome.
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 Windows Message Queuing allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Message Queuing (MSMQ) allows a locally authenticated low-privileged attacker to achieve full system compromise via a heap-based buffer overflow. Confirmed affected across a broad range of Microsoft Windows desktop and server platforms, from Windows Server 2012 through Windows Server 2025 and Windows 10/11 all versions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a locally authenticated session with at minimum a low-privileged (non-administrative) user account on the target Windows system, as confirmed by the CVSS vector PR:L/AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score is well-supported by the vector: local access with low privileges and low attack complexity, yielding full confidentiality, integrity, and availability impact. … 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 addressing CVE-2026-62717 as documented in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62717; exact patched build numbers per platform are detailed in EUVD-2026-56637 (e.g., Windows Server 2025 patched at 10.0.26100.33296, Windows Server 2022 at 10.0.20348.5499, Windows 11 24H2 at 10.0.26100.9168). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Immediately (within 24 hours): Inventory systems running Windows Message Queuing, prioritizing domain controllers, file servers, and business-critical systems where insider threat risk is highest. …
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External POC / Exploit Code
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