Web Application Security Checklist Every Business Should Follow

The majority of web application breaches don't involve exotic zero-day exploits — they exploit well-documented, preventable gaps. This checklist, grounded in the OWASP Top 10, gives founders and engineering leads a practical way to sanity-check their application's security posture.

Access control & authentication

• Enforce strong password policies and support multi-factor authentication
• Verify that every API endpoint checks permissions server-side, not just in the UI
• Ensure session tokens expire and are invalidated on logout and password change
• Rate-limit login and password-reset endpoints to slow brute-force attempts

Data handling

• Encrypt sensitive data in transit (TLS) and at rest
• Never log sensitive data such as passwords, tokens, or full payment details
• Validate and sanitize all user input on the server, not just the client
• Use parameterized queries to prevent SQL injection

Infrastructure & dependencies

• Keep frameworks, libraries, and server software patched and up to date
• Run automated dependency vulnerability scans as part of your build pipeline
• Remove default credentials and unused admin interfaces before going live
• Restrict cloud storage buckets and databases from public access by default

Process

• Run a security review before major releases, not just once a year
• Have an incident response plan documented before you need it
• Conduct a penetration test at least annually, and after significant architecture changes

Security isn't a feature you add at the end — it's a set of habits built into how your team ships software every week.

If you're unsure where your application stands against this checklist, our cybersecurity team offers structured vulnerability assessments that map directly to these categories.