Microsoft Windows MIDI Service Module: Elevation of privilege via use-after-free
Summary
A use-after-free vulnerability in the Windows MIDI Service Module allows an authorized local attacker to elevate privileges. The attacker needs a low-privilege local account and must win a race condition. According to the CVSS vector, successful exploitation could give high impact on confidentiality, integrity and availability.
Affected
- Windows 11 Version 24H2: 10.0.26100.0 to before 10.0.26100.9974
- Windows 11 Version 25H2: 10.0.26200.0 to before 10.0.26200.9974
- Windows 11 Version 26H1: 10.0.28000.0 to before 10.0.28000.3501
- Windows 11 Version 26H2: 10.0.26300.0 to before 10.0.26300.9974 (unverified, check MSRC)
- Windows 10, Windows Server and older builds: Unknown.
Fixed in
- Security update of 10 November 2026 (fixed builds per the MSRC entry; KB numbers not retrieved, please take them from MSRC).
Workaround
- No vendor workaround found. Unknown.
- Optional, not verified: on systems that do not need MIDI hardware or music software, disabling the MIDI service may reduce exposure. Test first; service name and impact not verified.
Exploitation
- Microsoft lists the vulnerability as not exploited.
- No public proof of concept found.
- Not listed as known exploited (CISA KEV not directly checked).
- CISA SSVC: exploitation none, automatable no, technical impact total.
Our recommendation
- Install the November 2026 cumulative update on all Windows 11 24H2 to 26H2 endpoints as part of the normal patch cycle, prioritising multi-user PCs, terminal servers and workstations with untrusted software.
- Verify the fixed build numbers on the MSRC page.
- Check whether Windows 10 or Windows Server systems are affected, based on the MSRC product list.
- Restrict local logons and limit low-privilege accounts.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-105565 msrc.microsoft.com
- CVE.org CVE Record: CVE-2026-105565 www.cve.org
- Strix: CVE-2026-105565 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 09:34.
Original description (NVD)
Use after free in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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