CVE-2026-50488 in Windows
Summary
by MITRE • 07/14/2026
Improper neutralization of special elements used in a command ('command injection') in Windows Clipboard User Service allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
Command injection vulnerabilities occur when untrusted data is incorporated into system commands without proper sanitization or validation, creating opportunities for malicious execution. The Windows Clipboard User Service represents a critical system component that handles clipboard operations and user interactions within the Windows environment. This particular vulnerability manifests when the service fails to properly neutralize special characters or elements that could be interpreted as command delimiters or execution indicators within shell commands. The flaw exists in how the service processes user input or clipboard data that may contain malicious command sequences, allowing an attacker to inject arbitrary commands that execute with the privileges of the Clipboard User Service process.
The technical implementation of this vulnerability typically involves the service accepting clipboard content or user-provided parameters and directly incorporating them into system calls or shell executions without adequate input validation. Special characters such as semicolons, pipes, ampersands, or command separators can be leveraged to append additional commands to legitimate operations. When an attacker with authorized access to the system can manipulate clipboard contents or trigger specific service operations, they may exploit this weakness to execute malicious code within the service context. The privilege escalation aspect arises because the Clipboard User Service often runs with elevated privileges necessary for clipboard functionality, potentially enabling attackers to gain higher-level system access.
The operational impact of this vulnerability extends beyond simple command execution as it represents a local privilege escalation vector that can be exploited by authenticated users. Attackers who have legitimate access to the system but lack administrative privileges may leverage this flaw to elevate their access level and gain unauthorized control over system resources. The attack surface includes scenarios where clipboard manipulation occurs during normal user operations, making detection more challenging as malicious activities may appear as legitimate service interactions. This vulnerability aligns with CWE-77 and CWE-88 categories that specifically address command injection flaws in system components, representing a significant risk to Windows operating systems where service processes handle sensitive user data.
Mitigation strategies for this vulnerability require comprehensive input sanitization and validation mechanisms within the Clipboard User Service implementation. System administrators should ensure that all versions of Windows are updated with the latest security patches provided by Microsoft, as this type of vulnerability typically receives immediate remediation through official updates. Implementing proper command construction practices that utilize parameterized inputs or secure command execution methods can prevent the injection of malicious elements. Additionally, monitoring clipboard activity and service operations for unusual patterns may help detect exploitation attempts, though this approach requires careful consideration of performance impacts and false positive rates. The vulnerability demonstrates the importance of following secure coding practices as outlined in the OWASP Secure Coding Guidelines and aligns with ATT&CK technique T1059.003 for command and scripting interpreter usage, emphasizing the need for robust input handling in system services that process user-controllable data elements.