OWASP Top 10: The Web Vulnerabilities Every Developer Should Know

The OWASP Top 10 is a regularly updated list, maintained by a well-known nonprofit security community, of the most common and impactful vulnerabilities found in real web applications. It's not an abstract academic list — it's compiled from actual data about what keeps breaking in production software. If you build or ship web applications, this is the baseline list worth actually understanding, not just skimming once.

Why this list matters more than a generic "be secure" checklist

Security advice is often too vague to act on. The OWASP Top 10 is useful specifically because it's concrete — each category describes a real, well-understood class of bug, with well-established fixes. Here's what the categories actually mean in practice, in plain terms.

The categories, explained plainly

Broken access control

This is when a user can do or see something they shouldn't — viewing another user's data by changing an ID in the URL, or reaching an admin page without admin permissions. It's consistently one of the most common real-world findings, because access checks have to be applied correctly on every single route and action, and it only takes one missed check to create a real hole.

Cryptographic failures

Sensitive data — passwords, payment details, personal information — stored or transmitted without proper protection. This includes storing passwords in plain text or with weak hashing, and sending sensitive data over unencrypted connections.

Injection

This is the broader category that SQL injection belongs to — any case where untrusted input gets interpreted as commands instead of data, whether that's a database query, a system command, or something else the application executes on the user's behalf.

Insecure design

Some vulnerabilities aren't implementation bugs at all — they're the direct result of a feature designed without security in mind from the start, like a password reset flow that doesn't verify identity properly. This category is a reminder that security has to be part of the design conversation, not just a pass applied after the code is written.

Security misconfiguration

Default admin passwords never changed, unnecessary features left enabled, overly detailed error messages that leak internal system information to any visitor. Often the easiest category to fix and the easiest to overlook, precisely because none of it involves writing new code.

Vulnerable and outdated components

Using a library, framework, or dependency with a known, publicly disclosed vulnerability. This has become more common as modern applications pull in dozens or hundreds of third-party packages, any one of which can introduce a real risk if left unpatched.

Identification and authentication failures

Weak password requirements, no protection against repeated login attempts, session handling that doesn't expire or invalidate properly. This is the category that makes multi-factor authentication such a meaningful improvement — it protects the login itself even when other pieces have quietly gone wrong.

Software and data integrity failures

Trusting data or code from a source that hasn't been properly verified — for example, an update mechanism or a CI/CD pipeline that doesn't confirm what it's installing is actually what it claims to be.

Security logging and monitoring failures

Without proper logging, a breach can go unnoticed for a long time, and even after it's found, there's no record for understanding exactly what happened. Good logging doesn't prevent an attack, but it dramatically limits how much damage one can do before anyone notices.

Server-side request forgery

Tricking a server into making a request to a destination it shouldn't have access to, often an internal system that's not directly reachable from the public internet.

What to actually do with this list

Don't treat it as an exam to study for. Treat it as a real checklist for your own codebase: for each category, ask honestly whether your application has been specifically checked against it, not just "probably fine because we use a modern framework." Frameworks help, but they don't fully protect you from design decisions, misconfiguration, or one raw query someone wrote under deadline pressure.

A structured review against this exact list — not a generic scan, an actual review of your specific code and configuration — is the backbone of the application security work Burncode does, alongside infrastructure hardening and getting teams ready for a real compliance audit.