CVE-2026-20866: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1809
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20866) involves a race condition (CWE-362) in Windows Management Services on Windows 10 Version 1809 (build 10.0.17763.0). The flaw arises from improper synchronization when multiple processes concurrently access shared resources, enabling an authorized local attacker to elevate privileges. The CVSS v3.1 score is 7.8, reflecting high impact on confidentiality, integrity, and availability. The vulnerability requires high attack complexity and local privileges but no user interaction. Microsoft has released a patch to fix this issue.
Potential Impact
An authorized local attacker can exploit this race condition to elevate privileges on the affected Windows 10 Version 1809 system. Successful exploitation could lead to full system compromise, impacting confidentiality, integrity, and availability of the system.
Mitigation Recommendations
A patch is available from Microsoft to remediate this vulnerability. It is recommended to apply the official update promptly to mitigate the risk. Since this is not a cloud service, remediation depends on applying the patch on affected systems. No known exploits are reported in the wild at this time.
CVE-2026-20866: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1809
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20866) involves a race condition (CWE-362) in Windows Management Services on Windows 10 Version 1809 (build 10.0.17763.0). The flaw arises from improper synchronization when multiple processes concurrently access shared resources, enabling an authorized local attacker to elevate privileges. The CVSS v3.1 score is 7.8, reflecting high impact on confidentiality, integrity, and availability. The vulnerability requires high attack complexity and local privileges but no user interaction. Microsoft has released a patch to fix this issue.
Potential Impact
An authorized local attacker can exploit this race condition to elevate privileges on the affected Windows 10 Version 1809 system. Successful exploitation could lead to full system compromise, impacting confidentiality, integrity, and availability of the system.
Mitigation Recommendations
A patch is available from Microsoft to remediate this vulnerability. It is recommended to apply the official update promptly to mitigate the risk. Since this is not a cloud service, remediation depends on applying the patch on affected systems. No known exploits are reported in the wild at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.381Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69668ae0a60475309f9ae136
Added to database: 1/13/2026, 6:11:44 PM
Last enriched: 4/3/2026, 12:47:16 PM
Last updated: 5/7/2026, 4:37:05 PM
Views: 93
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