Microsoft Windows 10 1607: Elevation of privilege in WebDAV
Summary
A flaw in the WebDAV component of Windows 10 Version 1607 and Windows Server 2016 allows an attacker to elevate privileges on the local system. The bug is an untrusted pointer dereference (CWE-822). An attacker needs a valid low-privileged account or code running on the machine, and no user interaction is required. The impact is rated high for confidentiality, integrity and availability.
Affected
- Windows 10 Version 1607: builds 10.0.14393.0 before 10.0.14393.9612
- Windows Server 2016 (same build line): builds 10.0.14393.0 before 10.0.14393.9612
Fixed in
- Build 10.0.14393.9612 or later, included in Microsoft's October 2026 cumulative update
- Third-party sources list this update as KB5126868; confirm the KB number on the MSRC page before rollout
Workaround
Unknown. No Microsoft-documented workaround was found; the security update is the fix.
Exploitation
- Not listed in the CISA KEV catalogue
- CISA SSVC: exploitation none, automatable no
- EPSS about 0.3%
- No public proof of concept found in our research; this does not prove that none exists
- No known exploitation in the wild
Our recommendation
- Identify all Windows 10 1607 and Windows Server 2016 hosts
- Install the October 2026 cumulative update and confirm build 10.0.14393.9612 or later
- Prioritise multi-user systems, terminal servers and file servers
- Check whether these older releases still receive security updates before relying on the patch
- Install the complete cumulative update, as it also fixes other Windows 1607 flaws such as CVE-2026-96846
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – WebDAV
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5126653, KB5127648, KB5126646, KB5127646, KB5126835, KB5126836
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-96847 msrc.microsoft.com
- Vulners CVE record (CNA data) vulners.com
- Tenable Nessus plugin 365471 www.tenable.com
- VulDB CVE-2026-96847 vuldb.com
- OpenCVE CVE-2026-96847 app.opencve.io
- Vulnrichment CVE-2026-96847 vulners.com
- Strix CVE-2026-96847 www.strix.ai
- Strix CVE-2026-96846 (related WebDAV flaw) 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 2 Nov 2026, 00:51.
Original description (NVD)
Untrusted pointer dereference in WebDAV 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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