CVE-2026-50449 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 attackers to achieve local privilege escalation. The flaw occurs when the runtime fails to properly validate object references after memory deallocation, creating opportunities for malicious code to manipulate freed memory regions. Such vulnerabilities typically arise from insufficient null pointer checks or improper reference counting mechanisms within the runtime environment. The technical implementation involves the Windows Runtime subsystem maintaining object lifecycle management where a freed object reference persists in memory, allowing subsequent operations to access invalid memory locations. Attackers can exploit this by crafting specific payloads that leverage the dangling pointer to overwrite critical system structures or execute arbitrary code with elevated privileges. This vulnerability directly maps to common weakness enumeration CWE-416 which specifically addresses use-after-free conditions in software implementations. The operational impact extends beyond simple privilege escalation as it provides attackers with elevated system access that can be leveraged for persistent access, data exfiltration, or further network compromise. The attack vector requires local authentication since the vulnerability exists within the Windows Runtime environment and is accessible only to authenticated users who can interact with the runtime components. From a tactical perspective, this vulnerability aligns with ATT&CK technique T1068 which covers privilege escalation through local exploits, specifically targeting the Windows Runtime as an attack surface. The exploitation process typically involves allocating memory structures, triggering the use-after-free condition, and then manipulating the freed memory to redirect execution flow or modify system-critical data structures. Organizations should implement immediate mitigations including applying security patches from microsoft, monitoring for unusual runtime behavior, and implementing least privilege principles to limit potential impact. The vulnerability demonstrates the importance of proper memory management practices in runtime environments and highlights the critical need for comprehensive code review processes that focus on object lifecycle management. Security teams must also consider this as a potential indicator of other related vulnerabilities within the Windows Runtime subsystem and conduct thorough assessments of similar patterns throughout the operating system components.