How do I secure a Serverless architecture against common API injection attacks?

All answers to this question.

Security in serverless is all about "Least Privilege." You must ensure that each Lambda function has its own execution role with the absolute minimum permissions required to perform its task. Don't use a single "God-mode" role for all functions. Use AWS WAF (Web Application Firewall) in front of your API Gateway to block SQL injection and Cross-Site Scripting (XSS). Additionally, since there are no servers to patch, your biggest risk is vulnerable third-party libraries. Use tools like Snyk or AWS Inspector to scan your deployment packages for known vulnerabilities before they go live.

   Answered 2025-11-13 by Patricia Adams

Have you looked into "API Key" management and "OAuth 2.0" integration with Amazon Cognito to handle user authentication and authorization at the gate, before the code even runs?

   Answered 2025-11-16 by Kenneth Clark

• Kenneth, we are currently planning to use Cognito for our user pools. I’m particularly interested in using "Authorizers" in API Gateway so that we can validate tokens at the edge. This way, if a request is unauthorized, the Lambda function never even executes, which not only improves security but also saves us money on execution costs. I’m also looking into "VPC Endpoints" to ensure that our internal traffic to DynamoDB never traverses the public internet, adding another layer of isolation.

     Commented 2025-11-19 by David Martinez

Monitor your execution times! A sudden spike in Lambda execution duration can be a sign of a Denial of Wallet (DoW) attack or an injection attempt that's hanging the process.

   Answered 2025-11-22 by Susan Moore

• That's a great point, Susan. In serverless, a performance issue is often a security issue or a cost issue in disguise. Monitoring is everything.

     Commented 2025-11-24 by Gary Wilson