If you’re just getting started in cybersecurity, you’ve probably heard the term OWASP Top 10. But what exactly is it? And why does everyone in the security world talk about it?
Let’s break it down in plain English — no jargon, no confusion.
What is OWASP?
OWASP stands for Open Web Application Security Project. It’s a non-profit organisation made up of security researchers, developers, and experts from around the world. Their goal is simple — make the internet more secure.
One of their most famous projects is the OWASP Top 10 — a list of the 10 most dangerous security vulnerabilities found in web applications.
Think of it as a “most wanted” list for hackers.
Why Should You Care?
Almost every website you use — banking apps, social media, shopping sites — is a web application. These apps can have weaknesses that hackers exploit to steal data, take over accounts, or crash systems.
The OWASP Top 10 tells developers and security testers exactly what to look for and fix.
OWASP Top 10 — 2025 Edition
The 2025 list is the latest update. Two new categories were added this year. Let’s go through each one simply.
1. Broken Access Control 🔓
What it means in simple terms: Imagine a hotel where any guest can walk into any room — including the manager’s office. That’s broken access control.
It happens when a website doesn’t properly check who is allowed to do what.
Real example:
You’re logged in as a normal user. You change the URL from /user/123 to /user/124 and suddenly you can see someone else’s private data. That’s a classic broken access control bug.
Why it’s #1: It’s found in almost every web application.
2. Security Misconfiguration 🔧
What it means in simple terms:
The application or server is set up incorrectly — like leaving the default password on a router as admin:admin.
Real examples:
- A website showing detailed error messages that reveal its code
- A cloud storage bucket left open to the public
- An admin panel accessible without a password
Why it matters: These are easy wins for attackers — no skill required, just look for open doors.
3. Software Supply Chain Failures 📦 ⭐ NEW in 2025
What it means in simple terms: Modern apps use hundreds of third-party libraries and tools. If any one of those is compromised or has vulnerabilities, your entire app is at risk.
Real example: Think of it like buying ingredients from a supplier to cook a meal. If the supplier secretly adds poison to one ingredient, your meal becomes dangerous — even if you cooked it perfectly.
The famous Log4Shell vulnerability worked exactly like this — a tiny library used by thousands of apps had a massive flaw.
Why it’s new: Supply chain attacks have exploded in recent years.
4. Cryptographic Failures 🔐
What it means in simple terms: Sensitive data like passwords or credit card numbers aren’t being protected properly.
Real examples:
- Passwords stored as plain text in a database
- Sensitive data sent over HTTP instead of HTTPS
- Using old, weak encryption like MD5 to hash passwords
Simple rule: If private data leaks because it wasn’t encrypted properly — that’s a cryptographic failure.
5. Injection 💉
What it means in simple terms: An attacker sends malicious commands disguised as normal input — and the application accidentally runs them.
Real example: A login form asks for your username. Instead of typing a name, an attacker types:
' OR 1=1 --
If the app isn’t protected, this tricks the database into logging them in without a password. This is called SQL Injection and it’s one of the oldest hacking techniques still in use today.
Other types: Command injection, HTML injection, LDAP injection.
6. Insecure Design 📐
What it means in simple terms: The application was poorly planned from the start — the security problems are baked into the design itself, not just the code.
Real example: A password reset feature that sends a reset link with no expiry time. Even if the code is written perfectly, the design itself is flawed.
Key difference from other vulnerabilities: This isn’t about a coding mistake — it’s about a design mistake.
7. Identification and Authentication Failures 🪪
What it means in simple terms: The app can’t properly verify who you are — making it easy for attackers to pretend to be someone else.
Real examples:
- Allowing passwords like
123456 - No limit on login attempts (allowing brute force attacks)
- Session tokens that don’t expire after logout
- No two-factor authentication on sensitive accounts
Think of it as: A bouncer at a club who accepts fake IDs without checking them properly.
8. Software and Data Integrity Failures 📋
What it means in simple terms: The application blindly trusts data or software updates without verifying they haven’t been tampered with.
Real example: An app automatically downloads and installs updates from the internet without checking if the update is genuine. An attacker could replace the update with malware.
Another example: Insecure deserialization — where data sent to the app is blindly trusted and executed.
9. Security Logging and Alerting Failures 📊
What it means in simple terms: The application doesn’t keep proper records of what’s happening — so when an attack occurs, nobody notices.
Real example: A hacker tries thousands of passwords on your login page over several days. If the app doesn’t log failed attempts or alert anyone — the attack goes completely undetected.
Why it matters: You can’t defend against what you can’t see. Good logging is the difference between catching a breach in minutes versus months.
10. Mishandling of Exceptional Conditions ⚠️ ⭐ NEW in 2025
What it means in simple terms: What happens when something goes wrong in the app? If it’s not handled carefully, errors can open up security holes.
Real example: You submit an unexpected value in a form — instead of showing a friendly error message, the app crashes and displays its entire source code and file paths. That’s a gift to an attacker.
Another example: An app that “fails open” — meaning when an error occurs, it accidentally grants access instead of denying it.
Simple rule: Apps should always fail safely and quietly.
Quick Summary Table
| # | Vulnerability | Simple Description |
|---|---|---|
| 1 | Broken Access Control | Users can access things they shouldn’t |
| 2 | Security Misconfiguration | App or server set up incorrectly |
| 3 | Supply Chain Failures | Compromised third-party code ⭐ NEW |
| 4 | Cryptographic Failures | Sensitive data not protected properly |
| 5 | Injection | Malicious commands sent as input |
| 6 | Insecure Design | Security flaws built into the design |
| 7 | Auth Failures | App can’t verify who users really are |
| 8 | Integrity Failures | App trusts unverified data or updates |
| 9 | Logging Failures | Attacks go unnoticed due to poor logs |
| 10 | Exceptional Conditions | App fails in an unsafe way ⭐ NEW |
How to Use This as a Beginner
If you’re learning ethical hacking or web app security, use this list as your learning roadmap:
- Pick one vulnerability from the list
- Learn what it is and how it works
- Practice on legal platforms like HackTheBox or TryHackMe
- Move to the next one
By the time you’ve worked through all 10, you’ll have a solid foundation in web application security.
Final Thoughts
The OWASP Top 10 2025 isn’t just a list — it’s a roadmap for understanding how web applications get hacked. Whether you want to become a penetration tester, a developer, or just want to understand how the internet works under the hood, this list is the perfect starting point.
Bookmark it. Study it. Practice it.
Happy hacking — ethically! 🛡️