CVE-2026-49165 in Windows
Summary
by MITRE • 07/14/2026
Use of uninitialized resource in Microsoft Windows App Store allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical security flaw in the Microsoft Windows App Store application that stems from improper initialization of system resources during application execution. The issue manifests when the App Store component fails to properly initialize certain memory structures or system handles before utilizing them, creating opportunities for unauthorized information disclosure. Such uninitialized resource usage typically occurs when developers neglect to explicitly set initial values for variables or system components, leaving them in unpredictable states that can be exploited by malicious actors.
The technical implementation of this vulnerability involves the App Store application accessing resources that have not been properly allocated or initialized within the Windows operating system environment. When an authorized attacker executes crafted operations against the App Store service, they can leverage this uninitialized state to extract sensitive information from memory locations that should have been properly secured. This type of flaw falls under the category of improper initialization vulnerabilities as classified by CWE-457, which specifically addresses the use of uninitialized variables or resources in software development practices.
From an operational perspective, this vulnerability presents significant risks to system security and data integrity within Windows environments where the App Store is actively running. The local information disclosure capability allows attackers who have already gained authorized access to the system to extract potentially sensitive metadata, user session information, or other system artifacts that could be used for further exploitation. This represents a privilege escalation vector that can be particularly dangerous in enterprise environments where multiple users share systems and applications. The vulnerability's impact is amplified because it operates at the application level within the Windows ecosystem, making it difficult to detect through standard network-based security monitoring.
The attack surface for this vulnerability encompasses any system running Microsoft Windows App Store where an attacker has established a foothold with authorized privileges. This typically involves scenarios where users have legitimate access to the system but may be compromised through social engineering or other initial attack vectors. The exploitation process requires the attacker to understand the specific resource initialization patterns within the App Store application and craft targeted operations that can trigger the information disclosure behavior. This aligns with ATT&CK technique T1059 which involves executing malicious code through legitimate system processes, and T1005 which covers data from local system.
Mitigation strategies for this vulnerability should focus on both immediate remediation and long-term architectural improvements. Microsoft has issued patches that properly initialize the affected resources within the App Store application, addressing the root cause of the uninitialized resource usage. Organizations should prioritize applying these security updates across all Windows systems where the App Store is installed and actively used. Additionally, system administrators should implement monitoring solutions that can detect anomalous access patterns to system resources that might indicate exploitation attempts. The use of application whitelisting policies can also help prevent unauthorized modifications or execution of potentially malicious code that could exploit similar initialization vulnerabilities. Security teams should conduct regular vulnerability assessments focusing on resource initialization practices in Windows applications and maintain updated threat intelligence to identify potential exploitation attempts targeting such flaws.