CVE-2026-77880 in Control Web Panel
Summary
by MITRE • 11/02/2026
Control Web Panel (CWP) before webpanel_version 1.16 contains an OS command injection vulnerability in the loopback API password change route /newpass/, which runs as root. An attacker can inject arbitrary OS commands by manipulating the POST 'user' parameter that is passed unescaped into a shell command, achieving remote code execution with root privileges.
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Analysis
by VulDB Data Team • 11/02/2026
The Control Web Panel (CWP) represents a widely used open-source control panel for managing Linux-based web hosting servers, offering administrators tools to configure services such as Apache, Nginx, DNS, and email. Within the architecture of CWP prior to version 1.16, a critical security flaw exists in the loopback API endpoint responsible for changing user passwords, specifically located at the /newpass/ route. This vulnerability is classified under CWE-78, which denotes Improper Neutralization of Special Elements used in an OS Command, commonly known as OS command injection. The severity of this issue is exacerbated by the fact that the affected code executes with root privileges, granting any successful exploitation full administrative control over the underlying operating system.
The technical mechanism behind this vulnerability lies in the improper handling of input data within the password change functionality. When a request is made to the /newpass/ endpoint via POST method, the application accepts a user parameter intended to specify which account's password should be modified. Instead of validating or sanitizing this input before use, the software passes it directly into an OS command string without escaping special shell characters such as semicolons, pipes, or ampersands. This lack of neutralization allows an attacker to inject arbitrary operating system commands that are then executed by the root user account associated with the web server process. Because the loopback API is often accessible locally and sometimes exposed through misconfigured reverse proxies or internal network paths, this creates a direct path for remote code execution if authentication bypasses exist or if the service is improperly secured against local access abuse.
The operational impact of exploiting this vulnerability is catastrophic for any system running an affected version of Control Web Panel. Since the injected commands run with root privileges, an attacker can perform virtually any action on the server. This includes reading sensitive configuration files such as /etc/shadow to harvest password hashes, modifying system binaries to establish persistence mechanisms, installing backdoors or cryptominers, and pivoting to other systems within the internal network. The ability to execute commands as root effectively means total compromise of the host, leading to potential data breaches, service disruption, and loss of integrity for all hosted websites and applications on that server. This aligns with MITRE ATT&CK techniques related to Command and Scripting Interpreter abuse, specifically lateral movement or privilege escalation depending on the initial access vector used to reach this endpoint.
To mitigate this vulnerability, administrators must immediately upgrade Control Web Panel to version 1.16 or later, where the input validation logic has been corrected to properly sanitize user inputs before they are passed to system commands. In environments where immediate patching is not feasible due to compatibility constraints, temporary mitigations should include restricting access to the loopback API interface using firewall rules that limit connectivity to trusted local addresses only, and ensuring that no external-facing services expose this specific endpoint without robust authentication controls. Additionally, implementing strict input validation at the application layer for all user-supplied data is a fundamental security practice that prevents similar injection flaws across other modules of the control panel. Regular auditing of web server configurations and monitoring for unusual outbound network connections can also aid in detecting potential exploitation attempts before significant damage occurs.