EUVD-2026-56343
GHSA-6w3r-cj94-p4fm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local service trigger requires an existing low-privileged session (AV:L, PR:L); heap overflow with no race condition (AC:L) yields full system compromise with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in the Windows MIDI Service Module affects Windows 11 versions 24H2, 25H2, and 26H1 prior to their respective patched builds. An attacker with an existing low-privileged local account can exploit this flaw to achieve full SYSTEM-level access, gaining high confidentiality, integrity, and availability impact with no user interaction required. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold an existing low-privileged (standard user) account on the target system, as confirmed by PR:L and AV:L in the CVSS vector - remote unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H positions this as a high-severity local privilege escalation with low attack complexity, making it a reliable second-stage capability for threat actors who have already obtained an initial foothold. … 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 Microsoft's security update to bring affected Windows 11 systems to or beyond the following fixed builds: 10.0.26100.9168 for Version 24H2, 10.0.26200.9168 for Version 25H2, and 10.0.28000.2704 for Version 26H1; these build numbers are sourced from EUVD data and should be verified against the official MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62688 before deployment. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and catalog all Windows 11 systems running versions 24H2, 25H2, or 26H1 in your environment using your asset management and CMDB systems, prioritizing production servers and workstations handling sensitive data. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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