Securing Your Web App: Common Vulnerabilities and Fixes

Most breaches come from well-known, preventable mistakes. Closing those gaps is the highest-leverage security work you can do.

Injection and untrusted input

Treat all user input as untrusted. Use parameterised queries and validation so hostile strings can't reshape your data or commands.

Cross-site scripting (XSS)

Escape output and avoid injecting unvalidated HTML. When raw HTML is required, sanitise it rigorously.

Authentication and secrets

Hash passwords properly, enforce strong auth, rotate and protect secrets, and respect the principle of least privilege on everything.

Wrapping up

Security is a set of habits, not a one-time audit. A short checklist on every merge prevents the bulk of real-world attacks.