CVE-2026-78464

Windows MIDI Service Module Elevation of Privileges Vulnerability

CVE-2026-78464 is fixed in 6 products on 1 platform, first by KB5124008, released September 8, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.0

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0020

10th percentile

<p>Time-of-check time-of-use (toctou) race condition in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 11 Version 24H2 for ARM64-based Systems		KB5124008	Sep 8, 2026
Windows 11 Version 24H2 for x64-based Systems		KB5124008	Sep 8, 2026
Windows 11 Version 25H2 for ARM64-based Systems		KB5124008	Sep 8, 2026
Windows 11 Version 25H2 for x64-based Systems		KB5124008	Sep 8, 2026
Windows 11 Version 26H1 for ARM64-based Systems	28000.2954	KB5124012	Sep 8, 2026
Windows 11 version 26H1 for x64-based Systems	28000.2954	KB5124012	Sep 8, 2026

Details

Published
September 8, 2026
Weakness
Time-of-check Time-of-use (TOCTOU) Race Condition
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78464

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