What is the OWASP Top 10?

The OWASP Top 10 exists to give the whole industry a shared, prioritized vocabulary for web application risk. Before it, every team argued about what mattered most. OWASP — the Open Worldwide Application Security Project — periodically aggregates vulnerability data from scanners, bug bounties, and contributing firms, then ranks the categories of risk that show up most often and hurt the most.

What it actually is

It is an awareness document, not a standard and not a checklist. Each entry is a category of weakness, not a single bug. The list is refreshed roughly every three to four years because the threat landscape shifts — for example, the latest revisions promoted Broken Access Control to #1 because authorization flaws are pervasive and high-impact, and added Insecure Design to push teams toward threat modeling rather than just patching.

A few of the categories

• Broken Access Control — users acting outside their intended permissions (IDOR, missing function-level checks).
• Cryptographic Failures — sensitive data exposed through weak or missing encryption.
• Injection — untrusted input changing the meaning of a query or command (SQLi, command injection, XSS).
• Security Misconfiguration — default credentials, verbose errors, unnecessary features left enabled.

Why it matters

The Top 10 is a floor, not a ceiling. Passing it does not make an app secure; it means you have addressed the most common ways apps get broken. For deeper assurance, OWASP points teams to the ASVS (Application Security Verification Standard).

Interviewers want to see you treat it as a prioritization aid and risk vocabulary — and that you know it is data-driven and evolves. Naming a couple of current categories with a one-line explanation each signals real familiarity rather than a memorized list.