CVE-2026-50348 in Windows
Summary
by MITRE • 07/14/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an unauthorized attacker to elevate privileges over a network.
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Analysis
by VulDB Data Team • 07/14/2026
A critical race condition vulnerability exists within the Windows Runtime environment that enables unauthorized attackers to achieve privilege escalation through concurrent execution of processes sharing common resources without adequate synchronization mechanisms. This vulnerability falls under the CWE-362 category known as "Concurrent Execution using Shared Resource with Improper Synchronization" and represents a fundamental flaw in how the operating system manages concurrent access to shared memory segments and system resources. The weakness manifests when multiple threads or processes attempt to access and modify the same resource simultaneously, creating a window of opportunity for malicious actors to exploit the temporal gap between resource checking and resource modification operations.
The technical implementation of this vulnerability exploits the inherent timing gaps in Windows Runtime's resource management protocols where proper locking mechanisms fail to prevent simultaneous access to critical system components. Attackers can leverage this race condition by carefully orchestrating concurrent processes that manipulate shared resources such as registry keys, file handles, or memory segments in a manner that allows them to overwrite or modify privileged system elements. The flaw specifically affects network-based exploitation scenarios where remote attackers can initiate the race condition through network services or remote procedure calls that trigger the vulnerable code paths within Windows Runtime components.
Operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise capabilities, as successful exploitation allows attackers to gain elevated privileges that enable them to execute arbitrary code with system-level permissions. The attack vector requires minimal user interaction and can be automated through network-based exploitation techniques, making it particularly dangerous for enterprise environments where Windows Runtime components are actively utilized. This vulnerability directly maps to ATT&CK technique T1068 which describes "Exploitation for Privilege Escalation" and potentially intersects with T1543 which covers "Create or Modify System Process" as attackers may use the elevated privileges to establish persistent access mechanisms.
Mitigation strategies should focus on implementing robust synchronization primitives throughout Windows Runtime components, including proper mutex usage, atomic operations, and comprehensive resource locking mechanisms. System administrators should ensure immediate patching of affected Windows versions through Microsoft security updates that address the specific race condition flaws in runtime execution environments. Network segmentation and firewall rules can help limit exposure by restricting access to vulnerable Windows Runtime services, while monitoring solutions should be configured to detect anomalous concurrent access patterns that may indicate exploitation attempts. Additionally, implementing application whitelisting policies and maintaining up-to-date system configurations through Microsoft's security baselines will reduce the attack surface for this particular vulnerability class.