Windows 11: Use-after-free in Bind Filter Driver enables local privilege escalation
Summary
A use-after-free vulnerability (CWE-416) in the Windows Bind Filter Driver allows an authorized local attacker to elevate privileges. The CVSS 3.1 base score is 7.8 (High), with high impact on confidentiality, integrity and availability. The attacker needs a local account with low privileges, so the flaw is a post-compromise or insider risk rather than an entry point from the internet.
Affected
- Windows 11 version 23H2: 10.0.22631.0 to before 10.0.22631.7652
- Windows 11 version 24H2: 10.0.26100.0 to before 10.0.26100.9711
- Windows 11 version 25H2: 10.0.26200.0 to before 10.0.26200.9711
- Windows 11 version 26H1: 10.0.28000.0 to before 10.0.28000.3231
- Windows 11 version 26H2: 10.0.26300.0 to before 10.0.26300.9711
- Windows Server 2025 (including Server Core): 10.0.26100.0 to before 10.0.26100.33650
Fixed in
- Windows 11 version 23H2: 10.0.22631.7652
- Windows 11 version 24H2: 10.0.26100.9711
- Windows 11 version 25H2: 10.0.26200.9711
- Windows 11 version 26H1: 10.0.28000.3231
- Windows 11 version 26H2: 10.0.26300.9711
- Windows Server 2025 (including Server Core): 10.0.26100.33650
- Patch channel: October 2026 security update. Build numbers to be confirmed on MSRC before change tickets are created.
Workaround
Unknown. No vendor-documented workaround has been found.
Exploitation
- Not listed in the CISA KEV catalog.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- No public proof of concept known as of the search. This is not a complete check.
- EPSS at capture was about 0.36%.
Our recommendation
- Install the October 2026 security update on all affected Windows 11 and Windows Server 2025 systems, prioritising shared workstations, RDS/terminal servers and hosts with local user or contractor accounts.
- Confirm the fixed build numbers on the MSRC advisory before rollout.
- Limit local logon to trusted users on multi-user systems.
- Monitor for unexpected privilege changes and new local administrator accounts.
Information from Microsoft (Patch Tuesday October 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-70274 msrc.microsoft.com
- NVD mirror on Vulners: CVE-2026-70274 vulners.com
- CVE list record on Vulners: CVE-2026-70274 vulners.com
- OpenCVE: CVE-2026-70274 app.opencve.io
- Strix: CVE-2026-70274 www.strix.ai
- Microsoft customer risk document 2026 CVEs (PDF) cdn-dynmedia-1.microsoft.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 2 Nov 2026, 03:53.
Original description (NVD)
Use after free in Windows Bind Filter Driver 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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