Windows Modern Device Management: Integer overflow allows local privilege escalation
Summary
Windows Modern Device Management (MDM), the Windows framework used to configure and control enrolled devices, contains an integer overflow or wraparound (CWE-190) that can lead to a heap-based buffer overflow (CWE-122). An authorized local user with a low-privileged account can exploit it to gain higher privileges, with full loss of confidentiality, integrity and availability on the affected host. Exploitation requires local logon or code execution and high attack complexity; no remote attack path is known.
Affected
- Windows 10 Version 1607 and Windows Server 2016 (incl. Server Core): 10.0.14393.0 before 10.0.14393.9688
- Windows 10 Version 1809 and Windows Server 2019 (incl. Server Core): 10.0.17763.0 before 10.0.17763.9487
- Windows 10 Version 21H2: 10.0.19044.0 before 10.0.19044.7846
- Windows 10 Version 22H2: 10.0.19045.0 before 10.0.19045.7846
- Windows 11 Version 23H2: 10.0.22631.0 before 10.0.22631.7711
- Windows 11 Version 24H2: 10.0.26100.0 before 10.0.26100.9974
- Windows 11 Version 25H2: 10.0.26200.0 before 10.0.26200.9974
- Windows 11 Version 26H1: 10.0.28000.0 before 10.0.28000.3501
- Windows 11 Version 26H2: 10.0.26300.0 before 10.0.26300.9974
- Windows Server 2022: 10.0.20348.0 before 10.0.20348.5870
Fixed in
- Fixed builds as listed in the official CVE record (first build not affected):
- Windows 10 1607 / Server 2016: 10.0.14393.9688
- Windows 10 1809 / Server 2019: 10.0.17763.9487
- Windows 10 21H2: 10.0.19044.7846
- Windows 10 22H2: 10.0.19045.7846
- Windows 11 23H2: 10.0.22631.7711
- Windows 11 24H2: 10.0.26100.9974
- Windows 11 25H2: 10.0.26200.9974
- Windows 11 26H1: 10.0.28000.3501
- Windows 11 26H2: 10.0.26300.9974
- Windows Server 2022: 10.0.20348.5870
- Cumulative update KB numbers: Unknown.
Workaround
No workaround or mitigation published. Unknown.
- Patching is the only confirmed remedy.
Exploitation
- No evidence of exploitation in the wild or public proof of concept at publication (Microsoft exploit code maturity: Unproven).
- CISA SSVC assessment: exploitation none, not automatable, total technical impact.
- CISA KEV status: Unknown.
Our recommendation
- Confirm the fixed build for each Windows version against the MSRC advisory and deploy the November 2026 cumulative update in the normal patch cycle.
- Prioritise multi-user PCs, terminal servers and any server with interactive logons.
- Until patched, limit local logons on sensitive endpoints and review local accounts on shared machines.
- Check the MSRC page for changes to the exploitation status.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Modern Device Management (MDM)
- 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 Response Center: CVE-2026-112987 msrc.microsoft.com
- CVE.org CVE Record: CVE-2026-112987 www.cve.org
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, 09:06.
Original description (NVD)
Integer overflow or wraparound in Windows Modern Device Management (MDM) 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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