CVE-2026-67614 in CyberPanel
Summary
by MITRE • 08/13/2026
CyberPanel before 3.0.0 contains a hard-coded JWT secret vulnerability in the WebTerminal FastAPI SSH service that allows unauthenticated remote attackers to forge valid authentication tokens and obtain an interactive root shell via WebSocket on port 8888. Attackers can craft a forged JWT signed with the hardcoded secret value, specifying ssh_user=root, to authenticate to the terminal service without any valid credentials and receive a root shell.
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Analysis
by VulDB Data Team • 08/13/2026
This vulnerability exists within CyberPanel versions prior to 300 where a critical security flaw has been identified in the WebTerminal FastAPI SSH service implementation. The core issue stems from a hard-coded JWT secret that is embedded within the application code, creating a fundamental weakness that undermines the entire authentication mechanism. This hardcoded credential serves as the cryptographic key for signing JSON Web Tokens used to authenticate users accessing the terminal service through WebSocket connections on port 8888. The flaw represents a classic security misconfiguration where sensitive cryptographic materials are not properly managed or randomized during deployment, making it trivial for attackers to exploit without requiring any legitimate credentials or authentication attempts.
The technical exploitation of this vulnerability follows a predictable pattern that aligns with common attack methodologies documented in the attack framework. An unauthenticated remote attacker can simply retrieve the hardcoded JWT secret through various reconnaissance methods including code analysis, reverse engineering, or by examining application deployment artifacts. Once obtained, the attacker can generate a valid JWT token using this secret value and manipulate the token claims to specify ssh_user=root, effectively bypassing all authentication mechanisms. This process directly maps to attack techniques described in the MITRE ATT&CK framework under credential access and privilege escalation categories, specifically leveraging hardcoded credentials as a means to achieve unauthorized system access.
The operational impact of this vulnerability is severe and potentially catastrophic for affected systems. Successful exploitation grants attackers immediate access to an interactive root shell through the terminal service, providing them with complete control over the compromised server environment. This level of access enables full system compromise including but not limited to data exfiltration, privilege escalation to other system users, installation of persistent backdoors, modification of critical system files, and potential lateral movement within network environments. The vulnerability affects systems where CyberPanel is deployed without proper security hardening measures, particularly those running versions earlier than 300, making it a widespread concern across numerous production environments.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. The most critical immediate action involves upgrading to CyberPanel version 300 or later where the hardcoded JWT secret has been properly addressed through secure credential management practices. Organizations should also implement network segmentation to restrict access to port 8888, ensuring that only authorized personnel can reach the terminal service. Additionally, security monitoring should be enhanced to detect suspicious authentication patterns and unauthorized WebSocket connections. The vulnerability demonstrates a clear violation of security best practices and aligns with CWE-798 which specifically addresses the use of hard-coded credentials in software applications, emphasizing the need for proper credential management and secure configuration practices throughout the software development lifecycle.
This vulnerability type represents a well-known class of security issues that frequently appears in web applications and service implementations where cryptographic keys are not properly managed or randomized during deployment. The flaw exemplifies how seemingly minor configuration oversights can create critical security weaknesses that undermine the entire security architecture. Organizations should implement comprehensive security testing procedures including static code analysis, penetration testing, and credential scanning to identify similar hard-coded secrets across their software infrastructure. Regular security audits and adherence to secure coding standards are essential to prevent such vulnerabilities from being introduced during development phases, particularly focusing on proper key management practices and avoiding hardcoded cryptographic materials in production code deployments.