Description
Improper access control in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
Published: 2026-10-13
Score: 5.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Local Unauthorized Tampering
Action: Patch OS
AI Analysis

Impact

This vulnerability arises from an improper access control condition in Windows Modern Device Management (MDM), which permits an attacker who already possesses local authorization to tamper with system configuration settings. The flaw is mapped to CWE‑862, indicating missing authorization on a function that should be protected. Because the attacker must already be authenticated on the host, the impact is confined to local tampering rather than remote intrusion, but it can compromise configuration integrity and device management policies.

Affected Systems

Affected installations include multiple recent Windows client and server releases. Certified windows 10 versions 1809, 21H2, and 22H2 are impacted, as are Windows 11 releases 23H2, 24H2, 25H2, 26H2, and 26H1. Microsoft Windows Server 2019, the Server 2019 Core edition, Windows Server 2022, and Windows Server 2025, including their core variants, are also vulnerable. Versions are delivered for Windows 10 on x86 architectures and for Windows 11 and Server editions on both x86 and arm64 platforms.

Risk and Exploitability

The CVSS score of 5.5 reflects a moderate severity, and there is no legacy KeV listing, indicating that known exploitation is not widespread at this time. The EPSS score is not available, so the exact contemporary exploitation probability is unclear. The likely attack vector is local, requiring an attacker to already have a valid authenticated session on the affected device. Once access is achieved, the attacker can modify MDM settings, potentially enabling unauthorized actions or altering configuration for further attacks. Because of the local nature of the exploit, the threat is mitigated by controlling privileged user accounts and timely patching, but the risk remains significant enough to warrant prompt remediation.

Generated by OpenCVE AI on October 14, 2026 at 13:54 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest Microsoft Windows security update that addresses this vulnerability.
  • Review and tighten MDM configuration, ensuring that only explicitly authorized accounts have modification rights.
  • If an update cannot be applied immediately, enforce least‑privilege on local accounts and consider disabling unused MDM functions.

Generated by OpenCVE AI on October 14, 2026 at 13:54 UTC.

Tracking

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Advisories

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History

Fri, 23 Oct 2026 18:15:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)

Tue, 20 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows 11 26h2
CPEs cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*
Vendors & Products Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows 11 26h2

Wed, 14 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 13 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Description Improper access control in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.
Title Windows Modern Device Management (MDM) Tampering Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows 11 Version 26h2 For Arm64-based Systems
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-862
CPEs cpe:2.3:a:microsoft:windows_11_version_26h2_for_arm64-based_systems:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows 11 Version 26h2 For Arm64-based Systems
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Windows 10 1809 Windows 10 21h2 Windows 10 21h2 Windows 10 22h2 Windows 10 22h2 Windows 11 23h2 Windows 11 23h2 Windows 11 24h2 Windows 11 24h2 Windows 11 25h2 Windows 11 25h2 Windows 11 26h1 Windows 11 26h1 Windows 11 26h2 Windows 11 Version 26h2 For Arm64-based Systems Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-10-31T18:07:04.317Z

Reserved: 2026-09-23T18:05:21.201Z

Link: CVE-2026-96855

cve-icon Vulnrichment

Updated: 2026-10-13T19:42:24.652Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-13T19:21:59.187

Modified: 2026-10-20T00:32:46.643

Link: CVE-2026-96855

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T18:00:13Z

Weaknesses