Race Condition in Microsoft Windows App Store Elevates Privileges

Executive Summary

CVE-2026-49784 is a race condition vulnerability in the Microsoft Windows App Store. It occurs due to improper synchronization when multiple processes or threads access a shared resource concurrently.

An authorized attacker with local access can exploit this race condition to elevate their privileges on the system. This means the attacker could gain higher-level permissions than originally granted, potentially allowing them to perform unauthorized actions.

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Impact Analysis

If exploited, this vulnerability could allow an attacker with local access to your system to elevate their privileges. This may lead to the following impacts:

• Unauthorized access to sensitive data or system functions.
• Installation of malware or other malicious software without detection.
• Modification or deletion of critical system files, leading to system instability or failure.
• Potential compromise of other systems or accounts if the elevated privileges are used to move laterally within a network.

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Compliance Impact

This vulnerability could impact compliance with several standards and regulations, depending on the context of its exploitation:

• GDPR: If the vulnerability leads to unauthorized access or exposure of personal data, it could result in a breach of GDPR requirements, particularly those related to data protection and security (Articles 5, 25, and 32). Non-compliance may lead to significant fines.
• HIPAA: For organizations handling protected health information (PHI), exploitation of this vulnerability could result in unauthorized access to PHI, violating the HIPAA Security Rule (45 CFR Part 164, Subpart C). This could lead to penalties and mandatory corrective actions.
• Other standards: Compliance with frameworks like ISO 27001, NIST SP 800-53, or PCI DSS may also be affected if the vulnerability undermines security controls related to access management, system integrity, or data protection.

Organizations should assess the risk posed by this vulnerability and apply necessary patches or mitigations to maintain compliance with applicable regulations.

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Mitigation Strategies

Apply the security update provided by Microsoft to address CVE-2026-49784. The update will patch the race condition vulnerability in the Windows App Store.

• Visit the Microsoft Security Response Center (MSRC) update guide for CVE-2026-49784 to download and install the latest patch.
• Ensure all systems running the affected Windows App Store version are updated promptly to prevent local privilege escalation.

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Detection Guidance

The provided context does not include specific detection methods or commands for identifying the race condition vulnerability in Microsoft Windows App Store (CVE-2026-49784).

Generally, detecting race conditions in software requires specialized tools or techniques such as:

• Using static or dynamic code analysis tools to identify improper synchronization in the application code.
• Monitoring system behavior with tools like Process Monitor or Windows Event Logs for unusual privilege escalation patterns.
• Reviewing Microsoft's official guidance or patches for this CVE, as they may provide detection scripts or indicators of compromise.

For precise detection steps, refer to Microsoft's official documentation or security advisories.

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