Windows Modern Device Management: Remote code execution due to weak encryption
Summary
A flaw in the Windows Modern Device Management (MDM) component allows an unauthenticated attacker on the network to execute code. The weakness is classified as inadequate encryption strength (CWE-326). Microsoft rates it High (CVSS 3.1 8.1), but the attack complexity is high and no exploitation has been reported.
Affected
- Windows 10 Version 1809 (builds below 10.0.17763.9487)
- Windows 10 Version 21H2 (builds below 10.0.19044.7846)
- Windows 10 Version 22H2 (builds below 10.0.19045.7846)
- Windows 11 Version 23H2 (builds below 10.0.22631.7711)
- Windows 11 Version 24H2 (builds below 10.0.26100.9974)
- Windows 11 Version 25H2 (builds below 10.0.26200.9974)
- Windows 11 Version 26H1 (builds below 10.0.28000.3501)
- Windows 11 Version 26H2 (builds below 10.0.26300.9974)
- Windows Server 2019, including Server Core (builds below 10.0.17763.9487)
- Windows Server 2022 (builds below 10.0.20348.5870)
- Windows Server 2025, including Server Core (build value conflicts between sources, see recommendation)
Fixed in
- Microsoft November 2026 security updates contain the fix.
- Reported KB5132061 for 24H2, 25H2 and 26H2 (not verified against MSRC).
- Fixed build for Windows Server 2025 is unclear: the CNA record lists 10.0.26100.33822, which conflicts with the 24H2 build.
- Fixed builds for Windows 11 23H2, Windows Server 2019/2022 and 26H1 are unconfirmed.
Workaround
Unknown.
Exploitation
- No exploitation reported as of the research date.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- CNA exploit maturity: Unproven (E:U).
- No public proof-of-concept found; this does not rule one out.
- Not confirmed in the CISA KEV catalog.
Our recommendation
- Install the November 2026 cumulative updates on all affected Windows 10, Windows 11 and Windows Server systems.
- Confirm the fixed build per product on the MSRC advisory before rollout.
- Prioritise internet-reachable systems and devices managed via MDM or Intune.
- Check whether MDM enrolment or management endpoints are exposed to the internet.
- Monitor the MSRC advisory and the NVD entry for updates, including KEV status.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Remote code execution – 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)
- KB5131085, KB5131096, KB5131090, KB5131087, KB5132061, KB5132043
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE Record (CVE Program) www.cve.org
- Microsoft Security Update Guide msrc.microsoft.com
- Strix CVE details (secondary aggregator) www.strix.ai
- BleepingComputer: Windows 11 KB5132061 and KB5131087 released www.bleepingcomputer.com
- NewsBeep: Microsoft November 2026 Patch Tuesday www.newsbeep.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, 01:46.
Original description (NVD)
Inadequate encryption strength in Windows Modern Device Management (MDM) allows an unauthorized attacker to execute code 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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