EUVD-2026-73699
GHSA-fjg5-3mv2-jjvp
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Physical USB enumeration requires no credentials and no user interaction; kernel-mode OOB read with full C/I/A impact is consistent with privilege escalation to SYSTEM.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Out-of-bounds read in Windows USB Mass Storage Class Driver allows an unauthorized attacker to elevate privileges with a physical attack.
AnalysisAI
Privilege escalation via out-of-bounds read in the Windows USB Mass Storage Class Driver affects virtually every supported Windows release, from Server 2012 through Windows 11 26H1. An attacker with physical access to the target machine can connect a specially crafted USB storage device to trigger the kernel-mode memory flaw, potentially achieving complete system compromise (C:H/I:H/A:H per CVSS). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Physical access to the target system is the mandatory prerequisite - the attacker must directly connect a USB storage device to an exposed port on the machine. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is materially constrained by the physical attack vector (AV:P): an attacker must have hands-on access to the target machine to plug in a malicious USB device, which eliminates remote or automated mass exploitation. … 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-released patches via Windows Update or the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69490. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Privilege Escalation
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External POC / Exploit Code
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