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CVE-2026-0756 is a critical remote code execution vulnerability affecting the GitHub Kanban Model Context Protocol server.
The flaw exists due to inadequate validation and sanitization of user-supplied arguments passed directly into system shell commands.
Specifically, the underlying backend utilizes unsafe execution wrappers like `execAsync` to handle parameters during issue creation requests.
An unauthenticated attacker can exploit this design flaw by supplying malicious shell metacharacters via tool parameters.
When the server processes the input, it executes arbitrary operating system commands under the service account’s privileges.
This allows complete system compromise without requiring any prior authentication or user interaction on the affected node.
The architecture of MCP servers often assumes trusted communication channels between clients and servers, bypassing robust input filters.
Security researchers discovered that string concatenation inside asynchronous execution routines opens direct pathways for command injection.
Mitigation strategies mandate strict parameterization and removal of direct shell interpretation logic across all tool definitions.
DailyCVE Form:
Platform: GitHub Kanban MCP
Version: All prior versions
Vulnerability: OS Command Injection
Severity: Critical severity level
date: January 20 2026
Prediction: Already patched upstream
What Undercode Say:
Analysis of the vulnerability reveals that input handling routines fail to neutralize command separators such as semicolons or backticks.
Reviewing the codebase shows vulnerable invocation patterns:
Vulnerable command execution pattern snippet
const { execAsync } = require('child_process');
async function createIssue() {
await execAsync(<code>git commit -m "${}"</code>);
}
Exploit: (Educational Purposes!)
To simulate the exploit payload against an unvetted parameter field, an attacker submits a crafted string designed to break out of the intended argument context:
Example payload injection string test_issue"; id;
This input terminates the current string context, appends arbitrary shell instructions, and comments out the trailing syntax.
Protection:
To protect systems against CVE-2026-0756, administrators and developers must immediately update the affected MCP server package to the latest patched release.
Additionally, applications should substitute shell-based command execution functions with safe API calls or array-based argument passing mechanisms that prevent shell injection.
Implementing rigorous input validation schemas using strict allowlists further neutralizes unexpected character sequences.
Impact:
Successful exploitation grants an unauthorized remote attacker arbitrary code execution capabilities with the privileges of the running server process.
This can lead to complete server takeover, exposure of sensitive GitHub access tokens, and lateral movement across connected local or cloud environments.
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Sources:
Reported By: github.com
Extra Source Hub:
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