CVE-2026-88146: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1809
Description
CVE-2026-88146 is a race condition vulnerability in the Windows Background Intelligent Transfer Service (BITS) on Windows 10 Version 1809 and related builds. It allows an authorized local attacker to elevate privileges due to improper synchronization when accessing shared resources. The vulnerability has a high severity rating and has been officially fixed by Microsoft.
CVSS v3.1
Score 7.0high
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 involves concurrent execution using a shared resource with improper synchronization (CWE-362) in the Windows Background Intelligent Transfer Service (BITS) component of Windows 10 Version 1809 and other specified builds. An authorized attacker with local access can exploit this race condition to elevate privileges on the affected system. The CVSS v3.1 base score is 7.0, indicating high severity, with attack vector local, high attack complexity, and low privileges required. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher system rights than intended. This could lead to full system compromise depending on the privileges escalated to. The vulnerability affects confidentiality, integrity, and availability as indicated by the CVSS vector (C:H/I:H/A:H).
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the security updates provided by Microsoft to affected Windows 10 versions as soon as possible to remediate this issue. No additional mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-09T21:53:00.398Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88146","vendor":"Microsoft"}]
Threat ID: 6ace85612cdf04f6569ff90b
Added to database: 10/13/2026, 19:24:17 UTC
Last enriched: 10/14/2026, 01:34:11 UTC
Last updated: 10/14/2026, 01:34:11 UTC
Views: 2
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