80% of your code is actually someone else's (npm/pip/NuGet packages). Track and patch vulnerable dependencies automatically.

Using tools like Snyk or SonarQube to catch "silly" mistakes in code.

Changing a URL parameter ?user_id=123 to ?user_id=1 to see the Admin’s private data.

Why parameterized queries and context-aware output encoding are non-negotiable.

Never hardcode API keys. Use environment variables or vaults (HashiCorp, AWS Secrets Manager). 5. Defense in Depth: The Browser as a Shield

Implementing a server-side check that validates the ownership of the record against the session token before returning data. 4. Hardening the Pipeline (DevSecOps) Security isn't a one-time event; it’s a lifestyle.

You cannot defend against what you don't understand. We focus on the big three: