Security is no longer a feature you can bolt on at the end of a project. With data breaches costing companies millions of dollars and their reputations, security must be integrated into every step of the software development lifecycle (DevSecOps).
1. Broken Access Control
Just because you hid a button in the UI doesn't mean the API endpoint is secure. Attackers will bypass the frontend and hit your APIs directly. Ensure that every single server-side request verifies the user's permissions.
2. Security Misconfigurations
Leaving default passwords on databases, exposing AWS S3 buckets to the public, or failing to patch software are incredibly common mistakes. Automation is key here. Use Infrastructure as Code (IaC) to ensure predictable, secure deployments.
"The only truly secure system is one that is powered off, cast in a block of concrete and sealed in a lead-lined room with armed guards. And even then I have my doubts."
3. Injection Flaws (SQL, NoSQL, XSS)
Never trust user input. Always use parameterized queries for databases and employ strict Content Security Policies (CSP) to mitigate Cross-Site Scripting (XSS) attacks. Modern frameworks like React help mitigate XSS by default, but developers must still be cautious when dangerously setting inner HTML.
