CVE-2026-71966 in CyberPanel
Summary
by MITRE • 08/10/2026
CyberPanel 2.4.3, fixed in commit eca0c3c, contains an authenticated command injection vulnerability in the remote backup transfer feature that allows authenticated attackers to execute arbitrary OS commands by controlling a remote server's API response. Attackers can inject malicious commands through a crafted directory name in the remote server's API response, which bypasses security middleware validation and is passed unsanitized to the OS command execution function.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability exists within CyberPanel version 2.4.3, specifically affecting the remote backup transfer functionality that was subsequently patched in commit eca0c3c. The flaw represents a critical authenticated command injection vulnerability that enables attackers who have already gained access to the system to escalate their privileges and execute arbitrary operating system commands. The vulnerability stems from insufficient input validation within the remote server API response handling mechanism, where directory names are directly processed without proper sanitization before being passed to OS command execution functions.
The technical exploitation occurs through a carefully crafted directory name within the remote server's API response that contains malicious command injection payloads. This allows attackers to manipulate the backup transfer process by inserting command separators and executable code into what should be benign directory path elements. The vulnerability bypasses existing security middleware validation controls because the system assumes that API responses from trusted remote servers are inherently safe, creating a trust boundary violation where legitimate-looking data is transformed into malicious execution vectors.
From an operational perspective, this vulnerability presents significant risk to systems running CyberPanel 2.4.3 as it requires only authenticated access to leverage command injection capabilities. Attackers can potentially execute commands with the privileges of the web server process, which typically runs with elevated system permissions. The impact extends beyond simple command execution to include potential data exfiltration, system compromise, and lateral movement within networks where CyberPanel is deployed.
The vulnerability aligns with CWE-78, which specifically addresses OS Command Injection flaws, and demonstrates characteristics consistent with ATT&CK technique T1059.001 for command and scripting interpreter. The attack chain typically involves initial authentication followed by manipulation of backup transfer parameters to inject malicious commands that are then executed without proper input sanitization or context-aware validation.
Mitigation strategies should include immediate patching to version 2.4.3 or later where the vulnerability has been addressed through proper input validation and sanitization of API response data. Organizations should implement additional security controls such as restricting backup transfer functionality to trusted networks, implementing more robust input validation at multiple layers, and monitoring for unusual command execution patterns. Network segmentation and principle of least privilege enforcement can help limit the potential impact if exploitation occurs, while regular security audits should verify that no other similar injection vulnerabilities exist in related components.
The root cause highlights the importance of treating all external data inputs as untrusted, regardless of their source or apparent legitimacy. Security middleware validation should not be bypassed for components that process API responses from remote servers, and all user-controllable parameters must undergo thorough sanitization before being processed by system commands. Regular security assessments and code reviews focusing on input handling and command execution flows can help identify similar vulnerabilities in other system components that may present analogous attack surfaces.
Organizations should also consider implementing automated monitoring solutions that can detect anomalous command execution patterns or unusual backup transfer activities, as these behaviors often indicate exploitation attempts. The vulnerability demonstrates how seemingly innocuous functionality like remote backup transfers can become attack vectors when proper security controls are absent from data processing pipelines, emphasizing the need for comprehensive security architectures that address both internal and external data flow validation.