Recently, a new vulnerability, designated as CVE-2026-42282, has been identified in the n8n-MCP tool. This vulnerability exposes sensitive arguments in authenticated HTTP requests. System administrators and hosting providers must take this development seriously as it affects server security.
n8n-MCP is a server that provides AI assistants access to node documentation and operations. Prior to version 2.47.13, the server logged sensitive parameters from authenticated MCP calls in plain text. This includes crucial information such as API keys and bearer tokens. If your logs are accessible by non-trusted parties, this can lead to serious security breaches.
As a system administrator or hosting provider, a vulnerability like CVE-2026-42282 increases the risk of unauthorized access to sensitive data. If attackers leverage this weakness, they can compromise credentials and personal data. This could not only damage your reputation but also put your clients at substantial risk.
First, ensure your n8n-MCP is updated to version 2.47.13 or later, as this issue has been patched in this release.
Next, audit your existing server logs. Look for any sensitive information that may have been logged during requests and take necessary actions to redact or purge this data.
Utilizing a web application firewall (WAF) can help block untrusted requests and mitigate the risk of brute-force attacks on your Linux server.
Finally, restrict access to your server logs. Ensure that only authorized personnel can view logs to minimize exposure.
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