CVE-2026-48571 in Windows
Summary
by MITRE • 07/14/2026
Use after free in Windows App Installer 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 App Installer component that enables local privilege escalation for authenticated attackers. The flaw occurs when the application installer fails to properly validate memory references after objects have been freed, creating opportunities for malicious code execution in privileged contexts. According to CWE-416, this specific weakness involves the use of memory after it has been freed, which directly aligns with the vulnerability's technical characteristics and exploitation patterns.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with elevated system privileges that can be leveraged for persistent access and further compromise. Attackers with local authenticated access can exploit this condition to execute arbitrary code with system-level privileges, potentially leading to complete system takeover. The Windows App Installer service typically operates with elevated permissions during package installation processes, making this vector particularly dangerous for local attackers who can manipulate the installation workflow.
From an attack perspective, this vulnerability aligns with several tactics described in the MITRE ATT&CK framework including privilege escalation techniques and persistence mechanisms. The use-after-free condition allows attackers to potentially overwrite memory structures with malicious payloads that execute with elevated privileges. This makes the vulnerability particularly attractive for attackers seeking long-term access to compromised systems.
Security practitioners should implement immediate mitigations including applying Microsoft security updates, monitoring for suspicious installation activities, and restricting local user privileges where possible. The vulnerability demonstrates the importance of proper memory management practices in system-level components and highlights the need for comprehensive code review processes that focus on resource management and memory safety. Organizations should also consider implementing least privilege principles to minimize the potential impact of such vulnerabilities when they do occur.
The technical nature of this flaw emphasizes the critical importance of secure coding practices, particularly around object lifetime management and memory deallocation procedures in Windows kernel-mode drivers and system services. Proper input validation and resource cleanup mechanisms are essential to prevent exploitation opportunities that could otherwise lead to complete system compromise.