ZDI-26-617: Microsoft Windows MIDI Service Incorrect Permission Assignment Local Privilege Escalation Vulnerability
ZDI disclosed CVE-2026-66804, a CVSS 7.8 incorrect permission assignment in Windows MIDI Service allowing local privilege escalation.
Zero Day Initiative advisory ZDI-26-617 details an incorrect permission assignment flaw in the Microsoft Windows MIDI Service. An attacker with the ability to run low-privileged code on an affected system can escalate privileges. ZDI rated the issue CVSS 7.8; the advisory provides no evidence of active exploitation.
- Local privilege escalation via incorrect permissions in Windows MIDI Service
- CVSS 3.0 score of 7.8 assigned by ZDI
- Exploitation requires prior low-privileged code execution
- CVEs
- CVE-2026-66804
- Vendors
- MicrosoftZero Day Initiative
- Products
- Windows
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-66804 | Local Privilege Escalation in Microsoft Windows Cross Device Service | 7.8 | 5% |
From the original article
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.
zerodayinitiative.com
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