CVE-2026-50457 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 • 07/14/2026
This vulnerability represents a critical use-after-free condition within the Windows Runtime component that enables authenticated local attackers to achieve privilege escalation. The flaw occurs when the system fails to properly validate memory references after objects have been freed, creating opportunities for malicious code execution and unauthorized access. Such vulnerabilities typically arise from improper memory management practices where developers do not adequately track object lifecycles or fail to implement proper reference counting mechanisms. The Windows Runtime environment handles complex inter-process communications and object marshaling between different application domains, making it a prime target for exploitation. When an attacker can manipulate the timing of object destruction and subsequent memory allocation, they may inject malicious code into the privileged execution context. This particular vulnerability aligns with CWE-416 which specifically addresses use-after-free errors in software implementations.
The operational impact of this privilege escalation vector is significant as it allows a local user who already has system access to elevate their privileges from standard user level to administrative or SYSTEM level access. This enables attackers to bypass normal security controls, modify critical system files, install malicious software, and potentially establish persistent backdoors within the compromised system. The attack requires only local authentication since the vulnerability exists in a component that processes legitimate user requests, making it particularly dangerous in multi-user environments where unauthorized users may gain initial access through social engineering or credential theft. Attackers can leverage this vulnerability to move laterally across networks, harvest sensitive data, and compromise entire enterprise infrastructures.
Mitigation strategies should focus on immediate patch deployment as provided by Microsoft security updates, which address the underlying memory management flaws in the Windows Runtime. Organizations must implement comprehensive monitoring solutions to detect anomalous privilege escalation attempts and ensure proper access controls are enforced through least privilege principles. System administrators should disable unnecessary Windows Runtime components where possible and maintain strict audit trails of privilege changes. Additionally, implementing application whitelisting policies can prevent exploitation by limiting which executables can run with elevated privileges. This vulnerability demonstrates the importance of thorough memory safety testing in system-level components and highlights the necessity of following secure coding practices such as those outlined in the OWASP Secure Coding Practices. The ATT&CK framework categorizes this as a privilege escalation technique through kernel exploits, emphasizing the need for robust kernel-mode protection mechanisms and regular security assessments of core operating system components to prevent exploitation of similar vulnerabilities.