Microsoft Windows: Elevation of privilege in Data Sharing Service Client
Summary
A local elevation of privilege flaw (CWE-59, link following) exists in the Data Sharing Service Client of Windows 10, Windows 11 and Windows Server. An authorized local user with low privileges can exploit it before a file is accessed to gain higher privileges on the system. Microsoft rates it CVSS 7.8 (High); an attacker needs local access and an existing user account, for example after phishing or malware.
Affected
- Windows 10 Version 1607: 10.0.14393.0 to before 10.0.14393.9688
- Windows 10 Version 1809: 10.0.17763.0 to before 10.0.17763.9487
- Windows 10 Version 21H2: 10.0.19044.0 to before 10.0.19044.7846
- Windows 10 Version 22H2: 10.0.19045.0 to before 10.0.19045.7846
- Windows 11 Version 23H2: 10.0.22631.0 to before 10.0.22631.7711
- Windows 11 Version 24H2: 10.0.26100.0 to before 10.0.26100.9974
- Windows 11 Version 25H2: 10.0.26200.0 to before 10.0.26200.9974
- Windows 11 Version 26H1: 10.0.28000.0 to before 10.0.28000.3501
- Windows 11 Version 26H2: 10.0.26300.0 to before 10.0.26300.9974
- Windows Server 2016 (including Server Core): 10.0.14393.0 to before 10.0.14393.9688
- Windows Server 2019 (including Server Core): 10.0.17763.0 to before 10.0.17763.9487
- Windows Server 2022: 10.0.20348.0 to before 10.0.20348.5870
Fixed in
- Install the November 2026 Windows security updates for your version (builds listed in the affected section or later).
- Per-OS KB numbers: check the MSRC advisory before rollout.
Workaround
Unknown.
Exploitation
- Microsoft reports the vulnerability as not exploited.
- No public proof of concept known.
- No reports of in-the-wild exploitation known.
Our recommendation
- Install the November 2026 Windows security updates in the normal patch cycle.
- Prioritize shared or multi-user systems, terminal servers and Windows 10 machines.
- Keep the Data Sharing Service Client patched, as it has had other recent flaws.
- Limit local user accounts and monitor for unusual privilege changes.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Data Sharing Service Client
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation more 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
- MSRC Security Update Guide: CVE-2026-95963 msrc.microsoft.com
- CVE Record CVE-2026-95963 www.cve.org
- Strix CVE-2026-95963 (third-party mirror) www.strix.ai
- Patch Tuesday November 2026 overview trinetriops.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, 02:55.
Original description (NVD)
Improper link resolution before file access ('link following') in Data Sharing Service Client 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.
Affected? We can help.
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