Windows Storage Spaces Controller: Heap buffer overflow leads to privilege escalation
Summary
A heap-based buffer overflow in the Windows Storage Spaces Controller allows an unauthorized attacker to elevate privileges over a network. According to the CVE data, the CVSS score is 8.8 (vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), so no privileges are required, but user interaction is. NVD analysis is still pending, so the vector and the network attack path should be verified against the Microsoft advisory before relying on them.
Affected
- Windows 10 Version 1607 and Windows Server 2016 (including Server Core): builds before 10.0.14393.9688
- Windows 10 Version 1809 and Windows Server 2019 (including Server Core): builds before 10.0.17763.9487
- Windows 10 Version 21H2: builds before 10.0.19044.7846
- Windows 10 Version 22H2: builds before 10.0.19045.7846
- Windows 11 Version 23H2: builds before 10.0.22631.7711
- Windows 11 Version 24H2: builds before 10.0.26100.9974
- Windows 11 Version 25H2: builds before 10.0.26200.9974
- Windows 11 Version 26H1: builds before 10.0.28000.3501
- Windows 11 Version 26H2: builds before 10.0.26300.9974
- Windows Server 2022: builds before 10.0.20348.5870
Fixed in
- Windows 10 Version 1607 and Windows Server 2016: 10.0.14393.9688
- Windows 10 Version 1809 and Windows Server 2019: 10.0.17763.9487
- Windows 10 Version 21H2: 10.0.19044.7846
- Windows 10 Version 22H2: 10.0.19045.7846
- Windows 11 Version 23H2: 10.0.22631.7711
- Windows 11 Version 24H2: 10.0.26100.9974
- Windows 11 Version 25H2: 10.0.26200.9974
- Windows 11 Version 26H1: 10.0.28000.3501
- Windows 11 Version 26H2: 10.0.26300.9974
- Windows Server 2022: 10.0.20348.5870
KB numbers: Unknown.
Workaround
Unknown.
Exploitation
Unknown. No evidence of active exploitation or public proof of concept was found at the time of writing.
Our recommendation
- Install the Microsoft security update for the affected Windows builds as soon as the KB numbers are confirmed in the MSRC advisory, after testing on a non-production host.
- Prioritise file servers and hosts that run Storage Spaces.
- Check whether SMB or other services on these hosts are reachable from outside the internal network, and restrict access.
- Monitor for unusual privilege changes and crashes on affected systems until patching is complete.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Storage Spaces Controller
- 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-2026-119392 msrc.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 10 Nov 2026, 20:28.
Original description (NVD)
Heap-based buffer overflow in Windows Storage Spaces Controller allows an unauthorized attacker to elevate privileges over a network.
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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