ZDI-CAN-30483: ZDI-26-617: Microsoft Windows MIDI Service Incorrect Permission Assignment Local Privilege Escalation Vulnerability
Published Sep 8, 2026
·Updated
This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-66804.
Affected Software
1 affected component
Microsoft Windows
Event History
Sep 8, 2026
Advisory Published
via ZDI·05:00 AM
Data Sourced
via ZDI·05:00 AM
Description
Frequently Asked Questions
1
Who can exploit this vulnerability?
An attacker must already be able to execute code with low privileges on an affected Windows system. This is a local privilege-escalation issue, so the provided information does not indicate remote exploitation without prior code execution.
2
What is the potential impact after successful exploitation?
A successful attacker can escalate privileges on the affected system. The advisory assigns a CVSS score of 7.8.