Executive brief
A security vulnerability exists in the Windows MIDI Service, a component responsible for handling musical instrument digital interface data. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to view sensitive data, install malicious software, or disrupt business operations.
Technical details
An improper access control vulnerability (CWE-284) exists in the Windows MIDI Service Module. The flaw allows a locally authenticated attacker with low privileges to bypass security restrictions and execute code with elevated permissions. The vulnerability is characterized by a CVSS 3.1 score of 8.8, notably including a 'Changed' Scope (S:C), indicating the impact can extend beyond the MIDI service itself to the underlying operating system. Microsoft has released security updates to address this issue across affected Windows 11 versions.
Affected products
- Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
- Microsoft Windows 11 Version 25H2 10.0.26200.0 to 10.0.26100.8875
- Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2269
Timeline
- 2026-07-14: disclosed
- 2026-07-14: advisory