A Living Baseline, Not a Checklist to Skim Once
The OWASP Top 10 is a regularly updated ranking of the most critical web application security risks, based on real-world data from organizations across the industry. It’s not exhaustive, but it represents the vulnerabilities that show up again and again in real breaches — which makes it a genuinely useful baseline.
Broken Access Control
Consistently the most common category in recent years — failures where users can access data or perform actions they shouldn’t be authorized for, often because authorization checks were only enforced in the UI rather than on the server. Every server-side endpoint needs its own authorization check; never trust that the frontend hiding a button means a user can’t still call the underlying API.
Cryptographic Failures
This covers exposing sensitive data due to weak or missing encryption — storing passwords in plaintext or with weak hashing, transmitting sensitive data over unencrypted connections, or using outdated cryptographic algorithms. Use established libraries and current best-practice algorithms rather than implementing cryptography yourself.
Injection
SQL injection is the most famous example, but the category covers any case where untrusted input is interpreted as code or commands — including command injection, LDAP injection, and NoSQL injection. Parameterized queries and ORMs that handle escaping automatically eliminate the vast majority of this risk class when used consistently.
Security Misconfiguration
Default credentials left unchanged, unnecessary features enabled, verbose error messages leaking stack traces to users, and missing security headers all fall under this broad and surprisingly common category. Automated configuration scanning and hardened default templates catch much of this before it ships.
Vulnerable and Outdated Components
Using libraries and frameworks with known vulnerabilities remains one of the easiest ways to get breached, precisely because the vulnerability is publicly documented and easy for an attacker to exploit. Automated dependency scanning (Dependabot, Snyk, and similar tools) integrated into CI catches this before a vulnerable version merges into your codebase.
Practical Application
- Enforce authorization checks server-side on every endpoint, never relying on frontend logic alone.
- Use parameterized queries and established ORMs rather than string-concatenated queries.
- Automate dependency vulnerability scanning as a required CI check, not an occasional manual review.
- Review the current OWASP Top 10 periodically — the ranking shifts as attack patterns evolve.