CVE-2026-85357: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 11 version 23H2
Description
CVE-2026-85357 is a race condition vulnerability in the Windows Phone Service component of Microsoft Windows 11 version 23H2. It allows an authorized local attacker to elevate privileges due to improper synchronization when concurrently accessing shared resources. The vulnerability has a high severity rating and affects multiple builds of Windows 11 version 23H2. An official fix is available from Microsoft.
CVSS v3.1
Score 7.0high
Affected software
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 2022
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-85357) involves a race condition (CWE-362) in the Windows Phone Service on Windows 11 version 23H2. Improper synchronization during concurrent execution of shared resources can be exploited by an authorized local attacker to elevate privileges. The CVSS v3.1 base score is 7.0, indicating high severity, with attack vector local, high attack complexity, low privileges required, and no user interaction. The vulnerability impacts confidentiality, integrity, and availability. Microsoft has published an official fix for affected versions.
Potential Impact
An authorized local attacker can exploit this race condition to elevate privileges on the affected Windows 11 systems. This could lead to full system compromise, affecting confidentiality, integrity, and availability of the system.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the available security updates for Windows 11 version 23H2 as provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85357 to remediate this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-03T17:43:43.827Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85357","vendor":"Microsoft"}]
Threat ID: 6ace85352cdf04f6569fe81f
Added to database: 10/13/2026, 19:23:33 UTC
Last enriched: 10/14/2026, 04:04:30 UTC
Last updated: 10/14/2026, 04:04:30 UTC
Views: 4
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