Windows MIDI Service Module: Null pointer dereference in local privilege escalation
Summary
A null pointer dereference in the Windows MIDI Service Module allows a local user with an existing account or foothold to elevate privileges. According to the CVSS vector (AV:L/AC:H/PR:H), the attack is local, highly complex and requires high privileges, and a successful attack would give full control over confidentiality, integrity and availability. Microsoft fixed the issue in its November 2026 Patch Tuesday release. No exploitation in the wild or public proof of concept has been found so far.
Affected
- Windows 11 Version 24H2: 10.0.26100.0 before 10.0.26100.9974
- Windows 11 Version 25H2: 10.0.26200.0 before 10.0.26200.9974
- Windows 11 Version 26H1: 10.0.28000.0 before 10.0.28000.3501
- Windows 11 Version 26H2: 10.0.26300.0 before 10.0.26300.9974
- Windows 10, Windows Server and older builds: Unknown.
Fixed in
- Windows 11 24H2: build 10.0.26100.9974 or later (November 2026 update)
- Windows 11 25H2: build 10.0.26200.9974 or later (November 2026 update)
- Windows 11 26H1: build 10.0.28000.3501 or later (November 2026 update)
- Windows 11 26H2: build 10.0.26300.9974 or later (November 2026 update)
- KB article numbers: Unknown.
Workaround
None confirmed for this CVE.
Exploitation
- Exploited in the wild: No evidence found.
- Public proof of concept: None found.
- CISA SSVC: Exploitation none, automatable no, technical impact total.
- CISA KEV status: Not checked.
Our recommendation
- Install the November 2026 cumulative update on all affected Windows 11 systems.
- Check Windows 10 and Windows Server applicability in the MSRC advisory.
- On hosts where MIDI hardware or software is not used, consider disabling the Windows MIDI Service until patched.
- Restrict local accounts on shared PCs and terminal servers.
- Recheck NVD and MSRC for analysis updates, especially exploitability and KEV listing.
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-2026-119901 msrc.microsoft.com
- CVE.org CVE Record: CVE-2026-119901 www.cve.org
- Cybersecurity News: Microsoft November 2026 Patch Tuesday cybersecuritynews.com
- Strix: CVE-2026-119901 www.strix.ai
- SentinelOne: CVE-2026-62688 (same component) www.sentinelone.com
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, 13:51.
Original description (NVD)
Null pointer dereference 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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