EUVD-2026-73813
GHSA-h5vr-v3jc-45hj
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only access and race-condition timing required (AV:L/AC:H); low-privilege authenticated account needed (PR:L); successful escalation yields full SYSTEM control (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Time-of-check time-of-use (toctou) race condition in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows 11 MIDI Service Module exploits a time-of-check time-of-use (TOCTOU) race condition, allowing an authenticated low-privilege local attacker to gain SYSTEM-level control of an affected endpoint. All three currently supported Windows 11 feature versions - 24H2, 25H2, and 26H1 - are affected prior to their respective cumulative update thresholds. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated low-privilege local account on the target Windows 11 system - the CVSS AV:L metric confirms remote unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) is internally consistent: local-only attack surface and high complexity suppress the base score relative to network-reachable LPE bugs, while the full C:H/I:H/A:H triad accurately reflects that a successful race win yields SYSTEM-level access. … 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 cumulative update that advances Windows 11 24H2 to build 10.0.26100.9445 or later, Windows 11 25H2 to 10.0.26200.9445 or later, and Windows 11 26H1 to 10.0.28000.2954 or later, as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78464. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 11 systems running feature versions 24H2, 25H2, or 26H1 that lack the latest cumulative updates. …
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External POC / Exploit Code
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