Sunwood-ai-labs command-executor-mcp-server OS Command Injection Vulnerability

A critical security vulnerability, identified as CVE-2026-7593, affects Sunwood-ai-labs command-executor-mcp-server versions up to 0.1.0. This vulnerability resides within the execute_command function of the src/index.ts file, a component of the MCP Interface. Successful exploitation allows a remote attacker to inject and execute arbitrary operating system commands on the server. The vulnerability has been publicly disclosed, making it a high-risk issue for systems running the affected software. The vendor was notified through an issue report but has not yet responded, potentially increasing the window of opportunity for attackers. Defenders should prioritize patching or mitigating this vulnerability to prevent unauthorized command execution and potential system compromise.

Attack Chain

1. Attacker identifies a vulnerable instance of Sunwood-ai-labs command-executor-mcp-server running version 0.1.0 or earlier.
2. The attacker crafts a malicious request targeting the execute_command function within the MCP Interface.
3. The malicious request includes an OS command injection payload.
4. The execute_command function in src/index.ts fails to properly sanitize or neutralize the input, passing it directly to the operating system.
5. The operating system executes the attacker-supplied command with the privileges of the server process.
6. The attacker gains arbitrary code execution on the server.
7. The attacker can then use this access to perform further actions such as escalating privileges, installing malware, or exfiltrating sensitive data.

Impact

Successful exploitation of CVE-2026-7593 allows an attacker to execute arbitrary commands on the affected server. This could lead to complete system compromise, including data theft, service disruption, or the deployment of malicious software. Given the ease of exploitation and the public availability of exploit code, organizations using the vulnerable Sunwood-ai-labs command-executor-mcp-server are at significant risk. While the exact number of affected installations is unknown, the potential impact is severe due to the possibility of full remote control over the compromised server.

Recommendation

• Apply any available patches or updates from Sunwood-ai-labs to address CVE-2026-7593.
• Implement input validation and sanitization measures within the execute_command function to prevent OS command injection.
• Deploy the Sigma rule Detect Suspicious Command Execution via MCP Server to identify potential exploitation attempts (see below).
• Monitor network traffic for suspicious requests targeting the MCP Interface, specifically those containing command injection payloads.