CVE-2026-9773 in Unraid
Summary
by MITRE • 06/25/2026
Unraid Web Server ToggleState Command Injection Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Unraid. Authentication is required to exploit this vulnerability.
The specific flaw exists within ToggleState.php. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the www-data user. Was ZDI-CAN-30134.
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Analysis
by VulDB Data Team • 06/25/2026
The Unraid Web Server ToggleState Command Injection Remote Code Execution Vulnerability represents a critical security flaw that enables authenticated remote attackers to execute arbitrary code on affected systems. This vulnerability specifically resides within the ToggleState.php component of the Unraid web server interface, making it accessible through the web application's user authentication system. The flaw stems from insufficient input validation mechanisms that fail to properly sanitize user-supplied data before incorporating it into system command executions. Security researchers have identified this issue as ZDI-CAN-30134, highlighting its significance within the cybersecurity community.
The technical implementation of this vulnerability occurs when the ToggleState.php script processes user input without adequate sanitization or validation procedures. When an authenticated user submits malicious input through the web interface, the application directly incorporates this unvalidated data into system calls without proper escaping or filtering mechanisms. This primitive approach to input handling creates a command injection vector where attackers can append arbitrary commands that execute with the privileges of the www-data user account. The vulnerability operates at the intersection of improper input validation and insufficient output encoding, creating an environment where malicious payloads can be interpreted and executed by the underlying operating system.
The operational impact of this vulnerability extends beyond simple code execution capabilities to encompass full system compromise potential. Since the exploitation occurs within the web server context with www-data privileges, attackers can leverage this access to perform various malicious activities including but not limited to data exfiltration, system reconnaissance, privilege escalation attempts, and persistent backdoor installation. The authenticated requirement means that attackers must first obtain valid credentials or exploit additional vulnerabilities to gain initial access, but once achieved, the command injection capability provides a powerful weapon for further exploitation. This vulnerability directly maps to CWE-77 and CWE-88 within the Common Weakness Enumeration framework, specifically addressing improper neutralization of special elements used in OS commands.
Mitigation strategies for this vulnerability require immediate implementation of input validation and sanitization measures throughout the affected application code. Organizations should prioritize updating their Unraid installations to versions that address this specific command injection flaw, while also implementing proper parameter validation within ToggleState.php and similar components. Network segmentation and access control measures can help limit the potential impact of successful exploitation by restricting network access to critical systems. Security monitoring should focus on detecting anomalous command execution patterns and unusual system behavior that might indicate exploitation attempts. Additionally, implementing principle of least privilege configurations for web server processes and conducting regular security audits of web application code can significantly reduce the attack surface and prevent similar vulnerabilities from emerging in future deployments.
This vulnerability demonstrates the critical importance of proper input validation in web applications and highlights how seemingly minor implementation flaws can lead to severe security consequences. The presence of such vulnerabilities in widely deployed systems like Unraid underscores the need for comprehensive security testing, regular vulnerability assessments, and robust code review processes within software development lifecycles. Organizations should consider implementing automated security scanning tools and maintaining up-to-date threat intelligence to proactively identify and address similar command injection vulnerabilities across their infrastructure. The ATT&CK framework categorizes this type of vulnerability under privilege escalation and command execution techniques, emphasizing the need for layered defensive measures to protect against such attacks.