Windows Clipboard Server Race Condition Privilege Escalation

Executive Summary

CVE-2026-49183 is a race condition vulnerability in the Windows Clipboard Server. A race condition occurs when multiple processes or threads access a shared resource without proper synchronization, leading to unpredictable behavior.

In this case, the vulnerability allows an authorized attacker with local access to exploit improper synchronization in the Windows Clipboard Server. By doing so, the attacker can elevate their privileges on the system, gaining higher-level access than intended.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can impact you in the following ways:

• An attacker with local access to your system could exploit this vulnerability to gain elevated privileges, such as administrative rights.
• With elevated privileges, the attacker could install malicious software, modify system settings, or access sensitive data that would otherwise be restricted.
• The attacker could also use the elevated privileges to maintain persistence on the system, making it harder to detect and remove the threat.

This vulnerability is classified as 'Important' in severity, meaning it poses a significant risk if exploited.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability could affect compliance with common standards and regulations in the following ways:

• GDPR: If the vulnerability is exploited to gain unauthorized access to personal data, it could lead to a data breach. Under GDPR, organizations must protect personal data and report breaches within 72 hours. Failure to do so could result in significant fines.
• HIPAA: For organizations handling protected health information (PHI), this vulnerability could lead to unauthorized access to sensitive patient data. HIPAA requires safeguards to protect PHI, and a breach could result in penalties and legal consequences.
• Other standards like ISO 27001 or NIST frameworks require organizations to manage vulnerabilities and ensure proper access controls. Exploitation of this vulnerability could indicate a failure to meet these requirements, leading to non-compliance.

To maintain compliance, organizations should apply patches or mitigations provided by Microsoft to address this vulnerability promptly.

Useful 0 Not Useful 0

Mitigation Strategies

Apply the security update provided by Microsoft to address CVE-2026-49183. The update will patch the race condition in the Windows Clipboard Server that could allow privilege escalation.

To obtain the update, visit the Microsoft Security Response Center (MSRC) update guide for this CVE.

Useful 0 Not Useful 0

Detection Guidance

The provided context does not include specific detection methods or commands for identifying the vulnerability CVE-2026-49183 on a network or system. This vulnerability involves a race condition in the Windows Clipboard Server, which requires local access and specific conditions to exploit.

To detect potential exposure, you may check for the presence of the vulnerable Windows Clipboard Server component or verify if the system has received the necessary patches from Microsoft. However, no direct commands or tools are mentioned in the provided resources.

Useful 0 Not Useful 0