CVE-2026-42909: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Remote Desktop client for Windows Desktop
Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability involves a race condition (CWE-362) in the Microsoft Remote Desktop client for Windows Desktop version 1.2.0.0. Due to improper synchronization when accessing shared resources concurrently, an attacker can execute arbitrary code over a network without privileges. The issue is confirmed and publicly disclosed with a high CVSS 3.1 score of 7.5, indicating network attack vector, high impact on confidentiality, integrity, and availability, and requiring user interaction with high attack complexity. Microsoft has released an official fix to address this vulnerability.
Potential Impact
Successful exploitation allows an unauthorized attacker to execute arbitrary code remotely on the affected system, potentially leading to full compromise of confidentiality, integrity, and availability of the system running the vulnerable Remote Desktop client.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42909 to remediate this vulnerability.
CVE-2026-42909: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Remote Desktop client for Windows Desktop
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a race condition (CWE-362) in the Microsoft Remote Desktop client for Windows Desktop version 1.2.0.0. Due to improper synchronization when accessing shared resources concurrently, an attacker can execute arbitrary code over a network without privileges. The issue is confirmed and publicly disclosed with a high CVSS 3.1 score of 7.5, indicating network attack vector, high impact on confidentiality, integrity, and availability, and requiring user interaction with high attack complexity. Microsoft has released an official fix to address this vulnerability.
Potential Impact
Successful exploitation allows an unauthorized attacker to execute arbitrary code remotely on the affected system, potentially leading to full compromise of confidentiality, integrity, and availability of the system running the vulnerable Remote Desktop client.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the patch provided in the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42909 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-30T22:35:54.968Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42909","vendor":"Microsoft"}]
Threat ID: 6a284cc48dd33fbd8566480b
Added to database: 06/09/2026, 17:26:28 UTC
Last enriched: 07/29/2026, 21:47:44 UTC
Last updated: 07/31/2026, 19:30:13 UTC
Views: 56
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