Microsoft Windows FileCrypt Driver: Information disclosure vulnerability
Summary
A local user with low privileges can exploit a flaw in the Windows FileCrypt Driver to read information they should not have access to. The impact is limited to confidentiality (high), with no integrity or availability impact. The risk is mainly relevant on multi-user systems such as terminal servers, file servers and shared workstations. The CVSS score of 5.5 (medium) comes from Microsoft as CNA.
Affected
- Windows 10 Version 1607 (below 10.0.14393.9688)
- Windows 10 Version 1809 (below 10.0.17763.9487)
- Windows 10 Version 21H2 (below 10.0.19044.7846)
- Windows 10 Version 22H2 (below 10.0.19045.7846)
- Windows 11 Version 23H2 (below 10.0.22631.7711)
- Windows 11 Version 24H2 (below 10.0.26100.9974)
- Windows 11 Version 25H2 (below 10.0.26200.9974)
- Windows 11 Version 26H1 (below 10.0.28000.3501)
- Windows 11 Version 26H2 (below 10.0.26300.9974)
- Windows Server 2016 and Server Core (below 10.0.14393.9688)
- Windows Server 2019 and Server Core (below 10.0.17763.9487)
- Windows Server 2022 (below 10.0.20348.5870)
Fixed in
- Security update from the November 2026 Patch Tuesday release, with the fixed builds listed in the affected section.
- Full list and KB articles: see the MSRC update guide.
Workaround
Unknown.
Exploitation
- No exploitation in the wild known.
- CISA SSVC: exploitation none, not automatable, partial technical impact.
- No public proof of concept found.
Our recommendation
- Apply the November 2026 cumulative update, starting with multi-user servers (terminal and file servers) and older builds such as 1607 and 1809.
- Check which systems still run unsupported Windows versions and replace or isolate them.
- Limit local accounts on shared systems to users who need them.
- Verify the installed build after patching.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Information disclosure – Windows FileCrypt Driver
- 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
- Microsoft Security Update Guide: CVE-2026-113757 msrc.microsoft.com
- CVE.org record CVE-2026-113757 www.cve.org
- Rapid7 Patch Tuesday November 2026 www.rapid7.com
- Senserva KB5131085 senserva.com
- BleepingComputer: Microsoft 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, 16:47.
Original description (NVD)
Improper access control in Windows FileCrypt Driver allows an authorized attacker to disclose information 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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