CVE-2026-20853: 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 WalletService allows an unauthorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20853) involves a concurrent execution issue caused by improper synchronization in the Windows WalletService on Windows 10 Version 1607 (build 10.0.14393.0). An attacker with local access can exploit this race condition to elevate their privileges. The vulnerability is classified under CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization). Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability allows a local attacker to elevate privileges on the affected system, potentially gaining higher-level access than intended. This could lead to full system compromise depending on the privileges gained. The CVSS v3.1 base score is 7.4, indicating a high severity impact on confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20853 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-20853: 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 WalletService allows an unauthorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.4high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20853) involves a concurrent execution issue caused by improper synchronization in the Windows WalletService on Windows 10 Version 1607 (build 10.0.14393.0). An attacker with local access can exploit this race condition to elevate their privileges. The vulnerability is classified under CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization). Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation of this vulnerability allows a local attacker to elevate privileges on the affected system, potentially gaining higher-level access than intended. This could lead to full system compromise depending on the privileges gained. The CVSS v3.1 base score is 7.4, indicating a high severity impact on confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20853 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.377Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20853","vendor":"Microsoft"}]
Threat ID: 69668ae0a60475309f9ae0fb
Added to database: 01/13/2026, 18:11:44 UTC
Last enriched: 07/30/2026, 23:45:04 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 183
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