Microsoft Windows Filtering Platform: Use after free allows local privilege escalation

Summary

A use-after-free flaw in the Windows Filtering Platform (WFP), the Windows framework behind network filtering, allows an authorized local attacker to elevate privileges. The attacker needs a low-privileged local account and the attack complexity is high. Successful exploitation could affect confidentiality, integrity and availability of the system.

Affected

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

Fixed in

• Security update as listed in the Microsoft Security Update Guide, build numbers as stated in the CVE record above.
• KB numbers: Unknown. Verify against the MSRC advisory before rollout.

Workaround

Unknown. No workaround or mitigation has been documented; patching is the only known remedy.

Exploitation

• No evidence of exploitation in the wild found at publication.
• No public proof-of-concept found.
• CVSS temporal rating E:U (exploit code maturity unproven).
• Rapid7 rates it Exploitation Less Likely; CISA SSVC lists exploitation as none.
• CISA KEV status: Unknown, not checked.

Our recommendation

• Patch affected Windows 10, 11 and Server systems in the normal monthly cycle, with priority on multi-user and terminal/RDS servers.
• Prioritise systems still on Windows 10 1607/1809 or enrolled in Extended Security Updates.
• Confirm the fixed build numbers against the MSRC advisory and verify that every affected build is covered.
• Limit local logon rights on shared systems and monitor for unusual privilege changes after phishing incidents.

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-2026-112756 msrc.microsoft.com
• CVE Record CVE-2026-112756 (CVE.org) www.cve.org
• Rapid7: Patch Tuesday November 2026 www.rapid7.com
• BleepingComputer: Microsoft November 2026 Patch Tuesday www.bleepingcomputer.com
• Strix: CVE-2026-112756 (unverified third-party ranges) 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, 09:27.