Microsoft Windows WMI: Out-of-bounds read leading to local privilege escalation
Summary
An out-of-bounds read in Windows Management Instrumentation (WMI) affects supported Windows 10, Windows 11 and Windows Server versions. An attacker with an existing local, low-privileged account can exploit it locally, and Microsoft describes the result as elevation of privilege. The CVSS vector rates only confidentiality impact, which is inconsistent with that description, so the impact should be verified on the Microsoft advisory. The attack is not possible remotely from the internet.
Affected
- Windows 10 Version 1607 (before 10.0.14393.9688)
- 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 2016 incl. Server Core (before 10.0.14393.9688)
- Windows Server 2019 incl. Server Core (before 10.0.17763.9487)
- Windows Server 2022 (before 10.0.20348.5870)
Fixed in
- Fixed in the November 2026 security updates; the build numbers above are taken from the CNA record.
- Third-party trackers list KB5131085 (Server 2019), KB5131080 (Server 2025), KB5131087 (Windows 11 23H2) and KB5132061 (Windows 11 24H2). These KB mappings are not verified against Microsoft.
Workaround
Unknown. No workaround is documented in the sources; Microsoft's update is the stated remedy.
Exploitation
- No confirmed in-the-wild exploitation known.
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- No public proof of concept found.
- Microsoft's vector indicates exploit code maturity 'Unproven'.
Our recommendation
- Install the November 2026 cumulative updates in the normal patch cycle, starting with servers, terminal servers and shared workstations.
- Confirm the fixed build for each system against the Microsoft Security Update Guide before rollout.
- Restrict local logons on multi-user systems and monitor for unusual privilege changes.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Management Instrumentation
- 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-2026-112814 msrc.microsoft.com
- CVE Record CVE-2026-112814 www.cve.org
- VulDB entry 434917 vuldb.com
- Senserva KB5131085 (Windows Server 2019) senserva.com
- Senserva KB5131080 (Windows Server 2025) senserva.com
- Senserva KB5131087 (Windows 11 23H2) senserva.com
- Senserva KB5132061 (Windows 11 24H2) senserva.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, 16:52.
Original description (NVD)
Out-of-bounds read in Windows Management Instrumentation 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.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.