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The command injection vulnerability in the browserstack-local Node.js package version 1.5.8 originates from improper sanitization of the logfile variable in the lib/Local.js file. When user-controlled input is passed to the logfile parameter during the configuration or execution of local testing processes, the application constructs system commands without adequate validation or escaping. Attackers can exploit this by injecting shell metacharacters—such as semicolons, ampersands, or backticks—into the logfile variable, allowing arbitrary command execution on the host operating system. This occurs because the input is directly concatenated into command strings that are executed via child processes in Node.js. The vulnerability enables remote code execution if the affected component is exposed to untrusted input, such as through network APIs or user interfaces. Specifically, by manipulating logfile paths, an attacker can append malicious commands that run with the privileges of the Node.js process, potentially leading to unauthorized access, data leakage, or full system compromise. The moderate severity rating reflects the need for specific conditions, like accessible attack vectors, but underscores significant risk in environments where browserstack-local is integrated without proper security controls.
Platform: browserstack-local
Version: 1.5.8
Vulnerability: Command Injection
Severity: Moderate
date: Jan 28 2026
Prediction: Patch within days
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Example exploit simulation using curl curl -X POST http://localhost --data "logfile=; id"
// Vulnerable code snippet from lib/Local.js
var userLogfile = req.body.logfile;
var cmd = 'browserstack-local --logfile=' + userLogfile;
require('child_process').exec(cmd);
how Exploit:
Inject shell commands via logfile parameter using metacharacters like ; or & to execute arbitrary code on the server.
Protection from this CVE
Sanitize input using validation libraries; avoid shell commands with user input; use execFile for safer execution.
Impact:
Remote code execution, system compromise, data breaches.
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Sources:
Reported By: github.com
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