CVE-2026-96855: CWE-862: Missing Authorization in Microsoft Windows 10 Version 1809
Description
CVE-2026-96855 is a medium severity vulnerability in Microsoft Windows 10 Version 1809 involving improper access control in Windows Modern Device Management (MDM). It allows an authorized local attacker to perform tampering due to missing authorization checks. The vulnerability affects multiple Windows 10 builds prior to specific patched versions. An official fix is available from Microsoft.
CVSS v3.1
Score 5.5medium
Affected software
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows 11 Version 26H2
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-96855) is due to missing authorization in Windows Modern Device Management (MDM) on Windows 10 Version 1809 and related builds. It allows an attacker with local authorized access to tamper with the system by bypassing proper access controls. The CVSS 3.1 base score is 5.5 (medium), with attack vector local, low attack complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or availability impact, but high integrity impact. Microsoft has issued an official fix for affected versions.
Potential Impact
An authorized local attacker can perform tampering actions on affected Windows 10 systems due to improper access control in the MDM component. This impacts system integrity but does not affect confidentiality or availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the latest security updates as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96855 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-23T18:05:21.201Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96855","vendor":"Microsoft"}]
Threat ID: 6ace857d2cdf04f656a004ab
Added to database: 10/13/2026, 19:24:45 UTC
Last enriched: 10/14/2026, 00:04:37 UTC
Last updated: 10/14/2026, 00:04:37 UTC
Views: 2
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