CVE-2026-50425 in Windows
Summary
by MITRE • 07/14/2026
Use after free in Windows Internal System User Profile allows an authorized attacker to elevate privileges locally.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical use-after-free condition within the Windows Internal System User Profile component that enables local privilege escalation for authenticated attackers. The flaw occurs when the system fails to properly validate or manage memory references after objects have been freed, creating opportunities for malicious code execution in kernel mode. The vulnerability stems from improper handling of user profile objects during system operations, particularly in scenarios involving profile management and user context switching. When an attacker successfully exploits this condition, they can manipulate freed memory regions to execute arbitrary code with elevated privileges, effectively bypassing standard security boundaries that typically protect kernel-level processes from user-space interference.
The technical implementation of this vulnerability involves exploiting the race condition between object deallocation and subsequent memory access within the Windows kernel subsystem responsible for user profile management. Attackers leverage this weakness by creating specific conditions that cause the system to free a user profile object while still maintaining references to it, allowing them to control the memory layout and inject malicious payloads. This type of vulnerability aligns with CWE-416 which specifically addresses use-after-free errors in memory management, where freed memory is accessed after it has been returned to the system pool. The exploitation process typically requires an authenticated user account to initiate the vulnerable code path, though once successful, the attacker gains access to kernel-level operations through the Windows Internal System User Profile mechanism.
From an operational impact perspective, this vulnerability poses significant risks to enterprise environments where local authentication is possible and system administrators may not be vigilant about monitoring for privilege escalation attempts. The vulnerability can be exploited in various scenarios including local login sessions, terminal server connections, or any environment where user profiles are actively managed by the Windows kernel. Security professionals must consider that successful exploitation results in complete system compromise, as attackers can access sensitive system resources, modify critical files, and potentially establish persistent backdoors through kernel-level access. The vulnerability's impact extends beyond simple privilege escalation to include potential data exfiltration, system integrity compromise, and lateral movement capabilities within networked environments where Windows systems are prevalent.
Mitigation strategies for this vulnerability should focus on both immediate patching and operational security improvements. Microsoft has released security updates addressing this specific use-after-free condition in the Windows Internal System User Profile component, making timely deployment of these patches essential for all affected systems. Organizations should implement robust monitoring for suspicious privilege escalation activities and consider restricting local login capabilities where possible to minimize exploitation vectors. Additionally, system administrators should ensure that user profile management operations are properly audited and that memory management practices follow secure coding guidelines to prevent similar vulnerabilities from emerging in other components. The ATT&CK framework categorizes such exploits under privilege escalation techniques, specifically targeting kernel-mode operations through use-after-free vulnerabilities. Organizations should also consider implementing application whitelisting policies and regular security assessments to identify potential exploitation opportunities before they can be leveraged by malicious actors.