Windows COM+ Event System Service: Local privilege escalation

Summary

A flaw in the Windows COM+ Event System Service, which delivers COM+ event notifications, allows an authorized local attacker to elevate privileges. The attacker needs an existing user account or foothold on the host, for example through a phished account or malware. Successful exploitation can give full control over the affected system (high confidentiality, integrity and availability impact). The flaw is not remotely exploitable, and no exploitation is known.

Affected

• Windows 10 Version 1607: 10.0.14393.0 to before 10.0.14393.9688
• Windows 10 Version 1809: 10.0.17763.0 to before 10.0.17763.9487
• Windows 10 Version 21H2: 10.0.19044.0 to before 10.0.19044.7846
• Windows 10 Version 22H2: 10.0.19045.0 to before 10.0.19045.7846
• Windows 11 Version 23H2: 10.0.22631.0 to before 10.0.22631.7711
• 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
• Windows Server 2016 (including Server Core): 10.0.14393.0 to before 10.0.14393.9688
• Windows Server 2019 (including Server Core): 10.0.17763.0 to before 10.0.17763.9487
• Windows Server 2022: 10.0.20348.0 to before 10.0.20348.5870

Fixed in

• Windows 10 Version 1607 and Windows Server 2016: 10.0.14393.9688
• Windows 10 Version 1809 and Windows Server 2019: 10.0.17763.9487
• Windows 10 Version 21H2: 10.0.19044.7846
• Windows 10 Version 22H2: 10.0.19045.7846
• Windows 11 Version 23H2: 10.0.22631.7711
• Windows 11 Version 24H2 and 25H2: 10.0.26100.9974 and 10.0.26200.9974
• Windows 11 Version 26H1: 10.0.28000.3501
• Windows 11 Version 26H2: 10.0.26300.9974
• Windows Server 2022: 10.0.20348.5870

Verify the KB mapping on the MSRC page.

Workaround

Unknown. No vendor workaround identified.

• Until patched, restrict interactive and local logon to trusted users.
• Limit local administrator rights.
• Keep endpoint detection and logging active to detect post-compromise escalation.

Exploitation

• Not known to be exploited in the wild. The CISA KEV status was not verified in this review.
• No public proof of concept found.
• Microsoft temporal vector: E:U (exploit code maturity Unproven), RC:C (report confidence Confirmed).
• CISA SSVC: exploitation none, automatable no, technical impact total.

Our recommendation

• Inventory Windows builds on all workstations and servers (for example with winver or a management tool).
• Patch shared workstations, Remote Desktop or terminal servers, and file or application servers first, using the fixed builds confirmed on the MSRC page.
• Isolate or upgrade devices with unsupported builds (such as 1607, 1809 or 21H2) unless they are covered by ESU or LTSC support.
• Until patched, restrict local logon and admin rights and monitor for signs of privilege escalation.

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-2026-113767 msrc.microsoft.com
• CVE.org record CVE-2026-113767 www.cve.org
• Strix.ai CVE-2026-113767 (third-party, versions 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, 04:11.