High · published December 30, 2025
⚠️ A minor feature, but a major risk! If you're using the experimental MCP server feature in the Serverless Framework, a sneaky command injection vulnerability is lurking beneath the surface. 🔥 Think of it like a kitchen chef who leaves the recipe card open for anyone to add their own ingredients. If the chef doesn't double-check those additions, someone might sneak in something harmful, like poison instead of spice! An attacker could exploit this vulnerability to inject arbitrary system commands, potentially leading to remote code execution with the server's privileges. This means they could take control of your server and access sensitive data or disrupt services entirely—absolutely devastating!
Think of it like a kitchen chef who leaves the recipe card open for anyone to add their own ingredients. If the chef doesn't double-check those additions, someone might sneak in something harmful, like poison instead of spice! This vulnerability stems from unsanitized user input in the MCP server's command execution process, allowing for shell metacharacter injections that can execute harmful commands via `child_process.exec`. It's a critical flaw in versions 4.29.0 to 4.29.2 of the Serverless Framework with MCP enabled.
An attacker could exploit this vulnerability to inject arbitrary system commands, potentially leading to remote code execution with the server's privileges. This means they could take control of your server and access sensitive data or disrupt services entirely—absolutely devastating! Upgrade to Serverless Framework version 4.29.3 to patch this vulnerability immediately. Ensure that any input being passed into command-line strings is properly validated and sanitized to prevent future exploitation. Don't overlook this as it affects a specific but real use case! You've got this! Follow these steps and keep your server safe and sound! 🛡️