Windows Kernel: Missing authorization allows local privilege escalation

Summary

A missing authorization check in the Windows kernel allows an authenticated local user to gain higher privileges, up to SYSTEM, on the affected machine. An attacker needs local access and a low-privileged account or an existing foothold, such as malware or a malicious document run by a user. The flaw does not provide remote access on its own, but it can be used to extend an attack chain. The CVSS base score is 7.8 (HIGH) and the official CVE record lists Windows 10, Windows 11 and Windows Server editions.

Affected

• Windows 10 Version 1809: before 10.0.17763.9487
• Windows 10 Version 21H2: before 10.0.19044.7846
• Windows 10 Version 22H2: before 10.0.19045.7846
• Windows 11 Version 23H2: before 10.0.22631.7711
• Windows 11 Version 24H2: before 10.0.26100.9974
• Windows 11 Version 25H2: before 10.0.26200.9974
• Windows 11 Version 26H1: before 10.0.28000.3501
• Windows 11 Version 26H2: before 10.0.26300.9974
• Windows Server 2019 (including Server Core): before 10.0.17763.9487
• Windows Server 2022: before 10.0.20348.5870
• Windows Server 2025 (including Server Core): before 10.0.26100.33822

Fixed in

• Cumulative updates that bring the systems to the build numbers listed above or higher. The KB article numbers are unknown; check the MSRC advisory.

Workaround

Unknown. No vendor workaround was found in the available sources.

Exploitation

• No known in-the-wild exploitation at the time of publication.
• No public proof of concept found in the available sources.
• CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
• CVSS temporal metric E:U (exploit code maturity unproven).

Our recommendation

• Install the Windows security update for all affected builds as soon as possible, starting with multi-user systems, terminal servers and RDS hosts.
• Verify the installed build numbers on all endpoints and servers against the list above.
• Limit local logon and code execution rights to the people who need them.
• Monitor for unexpected privilege changes and new SYSTEM processes, and keep endpoint protection active.

Public exploits iAttack code is publicly available (PoC on GitHub, Metasploit or Exploit-DB).

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

• Microsoft Security Update Guide: CVE-2026-112802 msrc.microsoft.com
• CVE.org Record CVE-2026-112802 www.cve.org
• Strix CVE listing (secondary, server entries unverified) 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, 04:16.