CVE-2026-50356 in Windows
Summary
by MITRE • 07/14/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Windows App Store allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a classic race condition scenario within the Microsoft Windows App Store component that enables local privilege escalation through improper synchronization of shared resources during concurrent execution. The flaw occurs when multiple processes or threads access the same resource simultaneously without adequate protective mechanisms, creating opportunities for malicious exploitation. Attackers can leverage this weakness by carefully orchestrating timing sequences to manipulate shared state variables and gain elevated privileges on the target system.
The technical implementation of this vulnerability stems from insufficient synchronization primitives within the Windows App Store application framework, where concurrent access to critical resources such as registry keys, file handles, or memory segments occurs without proper locking mechanisms. This design flaw allows an authorized user with standard privileges to manipulate the timing and execution flow of processes accessing shared resources, potentially leading to privilege escalation. The vulnerability is particularly dangerous because it operates within the legitimate Windows App Store context, making detection more challenging for traditional security controls.
From an operational impact perspective, this race condition enables local attackers to elevate their privileges from standard user level to system level without requiring additional authentication or exploitation of external vulnerabilities. The attack vector requires minimal prerequisites since the attacker only needs authorized access to the system and knowledge of the specific timing windows necessary to exploit the synchronization gap. This makes the vulnerability particularly concerning in enterprise environments where user accounts may have elevated permissions for legitimate business purposes.
Security professionals should implement multiple layers of mitigation strategies including regular Windows updates and patches, monitoring for unusual process execution patterns within App Store components, and restricting unnecessary user privileges on systems. The vulnerability aligns with CWE-362 which specifically addresses race conditions in concurrent programming, and maps to ATT&CK technique T1068 which covers privilege escalation through local exploitation. Organizations should also consider implementing application whitelisting policies and monitoring for suspicious registry modifications that could indicate exploitation attempts targeting this specific synchronization flaw.