CVE-2026-50323 in Windows
Summary
by MITRE • 07/14/2026
Use after free in Windows Runtime allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical use-after-free condition within the Windows Runtime subsystem that enables authenticated local attackers to achieve privilege escalation. The flaw occurs when the runtime fails to properly validate object references after memory deallocation, creating opportunities for malicious code execution and unauthorized privilege elevation. The vulnerability resides in the Windows Runtime component responsible for managing application interfaces and system interactions, making it a prime target for exploitation by adversaries with legitimate user credentials.
The technical implementation of this use-after-free vulnerability stems from improper memory management practices within the Windows Runtime environment where objects are freed from memory but references to these objects remain accessible. When an attacker can manipulate the runtime into accessing freed memory locations, they gain the ability to execute arbitrary code with elevated privileges. This type of vulnerability typically manifests through race conditions or improper reference counting mechanisms that fail to prevent access to deallocated resources. The flaw aligns with CWE-416 which specifically addresses use-after-free conditions in memory management.
Operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with potential access to system-level resources and capabilities that are normally restricted to administrators or system processes. Local privilege escalation through Windows Runtime use-after-free vulnerabilities can enable attackers to bypass standard security controls, access protected files, modify system configurations, and potentially establish persistent access within the compromised environment. The attack vector requires only local authentication, making it particularly dangerous in environments where user accounts may be compromised through social engineering or credential theft attacks.
Mitigation strategies for this vulnerability should focus on immediate patching of affected Windows Runtime components and implementation of additional runtime protections such as address space layout randomization and heap metadata validation. System administrators should implement the principle of least privilege, limit local user account capabilities, and monitor for suspicious process creation patterns that may indicate exploitation attempts. The vulnerability demonstrates the importance of proper memory management practices and highlights the need for comprehensive security testing of system-level components. Organizations should also consider implementing behavioral monitoring solutions that can detect anomalous patterns consistent with use-after-free exploitation techniques. This type of vulnerability often maps to attack techniques in the MITRE ATT&CK framework under privilege escalation categories, specifically targeting local account access and system binary modification tactics.