CVE-2026-38615: DedeCMS Command Execution Vulnerability

CVE-2026-38615 Overview

CVE-2026-38615 is a command execution vulnerability affecting DedeCMS V5.7.118. The flaw resides in file_manage_control.php, a file management component of the content management system. Attackers can exploit this issue over the network without authentication or user interaction to execute arbitrary operating system commands on the underlying server. The vulnerability is classified under [CWE-78] (Improper Neutralization of Special Elements used in an OS Command). Successful exploitation grants attackers full control over the affected web server, including the ability to read, modify, or delete site data and pivot deeper into the hosting environment.

Critical Impact

Unauthenticated remote attackers can execute arbitrary OS commands on servers running DedeCMS V5.7.118 via file_manage_control.php, leading to full server compromise.

Affected Products

• DedeCMS V5.7.118
• file_manage_control.php component
• Web servers hosting vulnerable DedeCMS installations

Discovery Timeline

• 2026-06-09 - CVE-2026-38615 published to NVD
• 2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-38615

Vulnerability Analysis

The vulnerability is an OS command injection flaw [CWE-78] in the file_manage_control.php script shipped with DedeCMS V5.7.118. DedeCMS is a widely deployed PHP-based content management system used for Chinese-language websites. The affected script handles file management operations within the administrative backend and content delivery flows.

The component fails to neutralize special characters before passing user-supplied input into an OS command context. As a result, attacker-controlled data reaches a shell execution function with shell metacharacters intact. An attacker who supplies crafted parameters can break out of the intended command and append arbitrary system commands.

Because the attack vector is the network and no privileges or user interaction are required, exploitation can be fully automated. Successful exploitation yields command execution under the privileges of the web server process, typically www-data, nobody, or an IIS application pool identity.

Root Cause

The root cause is improper input validation and unsafe construction of OS command strings inside file_manage_control.php. User input flows into a command execution sink such as system(), exec(), shell_exec(), or backticks without sanitization, escaping, or use of safe parameterized APIs.

Attack Vector

An unauthenticated remote attacker sends an HTTP request to the vulnerable endpoint exposed by file_manage_control.php. The request includes parameters containing shell metacharacters such as ;, |, &&, or backticks followed by arbitrary commands. The server concatenates the input into a shell command and executes it. Refer to the GitHub PoC Document for proof-of-concept details.

No verified exploit code is published in a structured format. The vulnerability mechanism follows the classic command injection pattern, where attacker input is passed unsanitized into a system shell call within the file management handler.

Detection Methods for CVE-2026-38615

Indicators of Compromise

• HTTP requests to file_manage_control.php containing shell metacharacters such as ;, |, &, backticks, or $() in query or POST parameters.
• Unexpected child processes spawned by the web server user, including sh, bash, cmd.exe, powershell.exe, curl, wget, or certutil.
• New or modified PHP files in DedeCMS web directories, particularly webshells dropped under /uploads/ or /include/.
• Outbound connections from the web server to unknown IP addresses immediately after requests to file management endpoints.

Detection Strategies

• Inspect web server access logs for requests to file_manage_control.php that contain URL-encoded shell metacharacters or unusually long parameter values.
• Correlate web access events with process creation events to flag cases where a request to DedeCMS precedes a shell or scripting interpreter execution.
• Deploy web application firewall rules that block command injection patterns targeting DedeCMS administrative scripts.

Monitoring Recommendations

• Enable verbose process auditing on hosts running DedeCMS to capture full command lines for processes spawned by the web server account.
• Monitor file integrity for the DedeCMS document root and alert on unauthorized additions or modifications to PHP files.
• Track egress traffic from web servers and alert on connections to non-business destinations following CMS administrative requests.

How to Mitigate CVE-2026-38615

Immediate Actions Required

• Restrict network access to DedeCMS administrative endpoints, including file_manage_control.php, using IP allowlists or VPN-only access.
• Deploy a web application firewall rule blocking shell metacharacters in parameters submitted to DedeCMS file management scripts.
• Audit the affected hosts for signs of prior exploitation, including unknown PHP files, scheduled tasks, and unexpected user accounts.
• Rotate credentials, API keys, and database passwords stored on or accessible from compromised servers.

Patch Information

At the time of publication, no official vendor patch for DedeCMS V5.7.118 addressing CVE-2026-38615 is listed in the NVD references. Administrators should monitor the DedeCMS project for an updated release that remediates the file_manage_control.php command execution flaw and apply it as soon as it becomes available.

Workarounds

• Remove or rename file_manage_control.php if the file management functionality is not required for production operation.
• Run the PHP-FPM or web server worker process under a least-privilege account with no shell access and restricted filesystem permissions.
• Enforce authentication and IP restrictions on the entire DedeCMS administrative backend at the web server or reverse proxy layer.
• Disable dangerous PHP functions such as system, exec, shell_exec, passthru, and popen in php.ini via the disable_functions directive where feasible.

# Configuration example: restrict access to the vulnerable script in nginx
location = /file_manage_control.php {
    allow 10.0.0.0/8;
    deny all;
}

# Disable dangerous PHP functions in php.ini
disable_functions = system,exec,shell_exec,passthru,popen,proc_open