Windows Filter Manager: Use after free allows local privilege escalation

Summary

A use-after-free vulnerability (CWE-416) in the Windows Filter Manager allows an authorized local attacker to elevate privileges. The attacker needs valid low-privilege access to the system and must overcome a high attack complexity. Microsoft rates the impact as high on confidentiality, integrity and availability, and the vulnerability is not known to be exploited.

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

• Install the Microsoft security update of November 2026 for each affected version (fixed builds: 10.0.14393.9688, 10.0.17763.9487, 10.0.19044.7846, 10.0.19045.7846, 10.0.22631.7711, 10.0.20348.5870, 10.0.26100.9974, 10.0.26200.9974, 10.0.28000.3501, 10.0.26300.9974).

Workaround

Unknown. No vendor workaround was found. Apply the security update.

Exploitation

• Publicly disclosed: No
• Exploited in the wild: Not known
• Public proof of concept: None found
• Microsoft temporal metrics: Exploit maturity Unproven
• CISA SSVC: Exploitation none, Automatable no, Technical impact total

Our recommendation

• Install the November 2026 security update on all listed Windows 10, Windows 11 and Windows Server systems.
• Confirm the installed build number after patching.
• Identify Windows 10 1607, 1809 and 21H2 systems and check whether they still receive security updates; unsupported systems cannot be fixed.
• Prioritise multi-user terminal servers, file servers and workstations where staff have local logon.
• Limit local logon rights and remove unneeded local accounts as additional hardening.

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-2026-113755 msrc.microsoft.com
• CVE Record CVE-2026-113755 (CVE.org) www.cve.org
• Rapid7: Patch Tuesday November 2026 www.rapid7.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, 09:04.