CVE-2025-53818: 
JavaScript vulnerability analysis and mitigation

GitHub Kanban MCP Server, a Model Context Protocol (MCP) server for managing GitHub issues in Kanban board format and streamlining LLM task management, was found to contain a command injection vulnerability (CVE-2025-53818). The vulnerability affects version 0.3.0 of the MCP Server, specifically in its tool definition and implementation. The issue was discovered and disclosed in July 2025, with a CVSS v4.0 base score of 8.9 (HIGH) (GitHub Advisory, NVD).

The vulnerability exists in the add_comment tool which relies on Node.js child process API exec to execute the GitHub (gh) command. The implementation is vulnerable to command injection attacks due to unsafe concatenation of untrusted user input. The vulnerability is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command). The issue allows attackers to execute arbitrary commands through shell character injection when the tool is called with specially crafted input (GitHub Advisory).

If successfully exploited, the vulnerability allows for user-initiated and remote command injection on a running MCP Server. Attackers can execute arbitrary commands on the host system running the MCP Server, particularly when Large Language Models (LLMs) are tricked through prompt injection to call the tool with malicious input containing special shell characters (GitHub Advisory).

The recommended mitigation is to avoid using the exec function and instead use execFile, which pins the command and provides the arguments as array elements. For cases where user input is not a command-line flag, it's recommended to use the -- notation to terminate the command and command-line flags, indicating that the text after the double dash notation is benign value. As of the time of publication, no official patches are available (GitHub Advisory).