EUVD-2026-73505
GHSA-rfp3-rj7c-p45h
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low existing privileges required to trigger race; AC:H reflects timing non-determinism; full C/I/A if race is won within unchanged scope.
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
Privilege escalation in the Windows MIDI Service Module on Windows 11 enables a low-privileged local attacker to gain full system control by exploiting a time-of-check time-of-use (TOCTOU) race condition (CWE-367). Affected builds span all three actively supported Windows 11 release tracks - 24H2, 25H2, and 26H1 - and Microsoft has released patches for each. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing authenticated session with at least low privileges (PR:L) on the target Windows 11 machine - a remote unauthenticated attacker cannot trigger this directly. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 7.0 appropriately reflects the exploitation difficulty: attack complexity is rated High (AC:H) because winning a TOCTOU race requires precise thread timing that is inherently non-deterministic and difficult to make reliable. … 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 patches for CVE-2026-69440 immediately via Windows Update or WSUS: update Windows 11 24H2 to build 10.0.26100.9445 or later, Windows 11 25H2 to build 10.0.26200.9445 or later, and Windows 11 26H1 to build 10.0.28000.2954 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 systems by their release track and identify those with multiple local user accounts. …
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External POC / Exploit Code
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