CVE-2026-20926: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1607
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20926) involves a race condition (CWE-362) in the Windows SMB Server on Windows 10 Version 1607 (build 10.0.14393.0). Improper synchronization during concurrent access to shared resources can be exploited by an authorized attacker over the network to elevate privileges. The vulnerability is confirmed and publicly disclosed with a CVSS 3.1 base score of 7.5, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to address this issue.
Potential Impact
An authorized attacker who can access the Windows SMB Server over the network may exploit this race condition to elevate their privileges on the affected system. This can lead to full compromise of confidentiality, integrity, and availability of the system. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators of Windows 10 Version 1607 (build 10.0.14393.0) should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20926 to remediate this vulnerability.
CVE-2026-20926: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1607
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20926) involves a race condition (CWE-362) in the Windows SMB Server on Windows 10 Version 1607 (build 10.0.14393.0). Improper synchronization during concurrent access to shared resources can be exploited by an authorized attacker over the network to elevate privileges. The vulnerability is confirmed and publicly disclosed with a CVSS 3.1 base score of 7.5, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix to address this issue.
Potential Impact
An authorized attacker who can access the Windows SMB Server over the network may exploit this race condition to elevate their privileges on the affected system. This can lead to full compromise of confidentiality, integrity, and availability of the system. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators of Windows 10 Version 1607 (build 10.0.14393.0) should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20926 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-04T20:04:16.336Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20926","vendor":"Microsoft"}]
Threat ID: 69668ae3a60475309f9ae1d2
Added to database: 01/13/2026, 18:11:47 UTC
Last enriched: 07/30/2026, 23:40:14 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 169
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