Windows: Use-after-free in Cloud Files Mini Filter Driver allows privilege escalation
Summary
A use-after-free vulnerability (CWE-416) in the Windows Cloud Files Mini Filter Driver allows an authorized local attacker to elevate privileges. The driver handles cloud file synchronization, such as OneDrive placeholder files. An attacker needs a valid low-privileged account and local access, for example after phishing or malware, so this is a privilege-escalation step rather than an entry point. Microsoft rates the impact on confidentiality, integrity and availability as high.
Affected
- Windows 10 Version 1809 (before 10.0.17763.9487)
- Windows 10 Version 21H2 (before 10.0.19044.7846)
- Windows 10 Version 22H2 (before 10.0.19045.7846)
- Windows 11 Version 23H2 (before 10.0.22631.7711)
- Windows 11 Version 24H2 (before 10.0.26100.9974)
- Windows 11 Version 25H2 (before 10.0.26200.9974)
- Windows 11 Version 26H1 (before 10.0.28000.3501)
- Windows 11 Version 26H2 (before 10.0.26300.9974)
- Windows Server 2019, including Server Core (before 10.0.17763.9487)
- Windows Server 2022 (before 10.0.20348.5870)
- Windows Server 2025, including Server Core (before 10.0.26100.33822)
Fixed in
Fixed in the November 2026 security update. Fixed builds are listed in the affected section. KB numbers: Unknown.
Workaround
Unknown.
Exploitation
- No public exploit code known at publication (CVSS exploit maturity: unproven).
- CISA SSVC: exploitation none, automatable no, technical impact total.
- No link to in-the-wild exploitation of this specific CVE has been found.
Our recommendation
- Install the November 2026 Windows security update on all Windows 10, Windows 11 and Windows Server systems, prioritizing systems with OneDrive or other cloud-sync clients.
- Verify the installed build against the fixed versions and the MSRC advisory.
- Limit local logons and untrusted files on servers and shared endpoints until patched.
- Monitor for new exploit reports after publication.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Cloud Files Mini Filter Driver
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation unlikely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131085, KB5131096, KB5131090, KB5131087, KB5132061, KB5132043
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-112763 msrc.microsoft.com
- CVE Record CVE-2026-112763 (CVE Program) www.cve.org
- Strix CVE-2026-112763 (third-party aggregator) 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, 09:25.
Original description (NVD)
Use after free in Windows Cloud Files Mini 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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