Microsoft Windows Filter Manager: Local privilege escalation via use-after-free
Summary
A use-after-free vulnerability in the Windows Filter Manager kernel component allows an authorized local user to elevate privileges. An attacker needs a valid low-privilege account or code already running on the host. Successful exploitation gives full control over the affected system (high confidentiality, integrity and availability impact).
Affected
- Windows 10 Version 1607 (Server 2016): builds before 10.0.14393.9688
- Windows 10 Version 1809 (Server 2019): builds before 10.0.17763.9487
- Windows 10 Version 21H2: builds before 10.0.19044.7846
- Windows 10 Version 22H2: builds before 10.0.19045.7846
- Windows 11 Version 23H2: builds before 10.0.22631.7711
- Windows 11 Version 24H2: builds before 10.0.26100.9974
- Windows 11 Version 25H2: builds before 10.0.26200.9974
- Windows 11 Version 26H1: builds before 10.0.28000.3501
- Windows 11 Version 26H2: builds before 10.0.26300.9974
- Windows Server 2022: builds before 10.0.20348.5870
- Product list per CNA record; not fully verified against MSRC, Windows Server 2025 not confirmed.
Fixed in
- Fixed in the Microsoft November 2026 security updates.
- Fixed builds per the CNA record are the versions listed under affected.
- Exact KB numbers per operating system: see MSRC.
Workaround
Unknown. No workaround has been published. Patching is the expected fix.
Exploitation
- No evidence of exploitation in the wild found.
- CVSS temporal vector indicates exploit maturity "Unproven" (E:U).
- No public proof-of-concept found.
- CISA SSVC: exploitation none, automatable no, technical impact total.
Our recommendation
- Install the November 2026 cumulative update on all affected Windows 10, 11 and Server systems, prioritising multi-user systems, terminal servers (RDS) and shared workstations.
- Replace or upgrade hosts running unsupported Windows 10 builds (1607, 1809).
- Restrict local logon rights and check for unnecessary local accounts.
- Monitor for suspicious local privilege escalation activity on critical hosts.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Filter Manager
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE Record (CNA: Microsoft) www.cve.org
- MSRC Security Update Guide msrc.microsoft.com
- KB summary (third party, senserva.com) senserva.com
- Tenable November 2026 Patch Tuesday review www.tenable.com
- BleepingComputer November 2026 Patch Tuesday www.bleepingcomputer.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, 03:32.
Original description (NVD)
Use after free in Windows Filter Manager 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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