Web security is a battlefield where attackers exploit weaknesses and defenders must stay vigilant. For beginners stepping into ethical hacking or cybersecurity, understanding the most common vulnerabilities is essential. These flaws are not just theoretical, they appear in real systems every day and learning how they work is the first step toward protecting against them.
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1. Broken Access Control — The Feature Targets Shouldn’t Have
Broken access control happens when users can access features or data they shouldn’t. Attackers exploit weak checks to elevate privileges or view restricted content.
Example (PHP): if($_GET[‘isAdmin’] == true){ showAdminPanel(); }
Here, simply changing a URL parameter could grant admin access. Proper role validation is critical to prevent this.
2. IDOR — The URL That Tells Too Much
Insecure Direct Object References (IDOR) occur when sensitive resources are exposed through predictable URLs. Attackers manipulate identifiers to access other users’ data.
Example: https://example.com/user?id=123
Changing id=123 to another number might reveal another user’s profile. Always enforce authorization checks on server-side requests.
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3. Cross-Site Scripting (XSS) — The Script That Could Run Maliciously
XSS occurs when attackers inject malicious scripts into web applications. If user input isn’t sanitized, the browser executes harmful code.
Example (HTML): <input value=”<script>alert(‘XSS’)</script>”>
Here, the attacker’s script runs in the victim’s browser. Always validate and encode user input to prevent this.
4. Cross-Site Request Forgery (CSRF) — The Button The Victim Doesn’t Click
CSRF tricks a logged-in user into performing unintended actions, like transferring money or changing account settings, without their knowledge.
Example (HTML): <img src=”https://bank.com/transfer?amount=1000&to=hacker”>
This hidden request executes when the image loads, forcing the victim’s browser to act. Anti-CSRF tokens and secure session handling are key defenses.
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5. SQL Injection — The Query That Betrays The Victim
SQL Injection happens when user input is directly embedded into database queries without proper sanitization. Attackers can manipulate queries to extract or destroy data.
Example (Sql): SELECT * FROM users WHERE id = ‘$_GET[id]’
If an attacker enters 1 OR 1=1, the query returns all users. Always use parameterized queries and prepared statements to prevent this.
6. Security Misconfiguration — The Door Left Open
This vulnerability arises when systems are left with default settings, exposed debug pages, or weak credentials. Attackers exploit these oversights to gain easy access.
Example (Bash): # Default admin password: admin123
Leaving default passwords unchanged or exposing configuration files is like leaving the front door unlocked. Regular audits and secure configurations are essential.
Conclusion: Building a Strong Hacking and Security Mindset
These six vulnerabilities which are Broken Access Control, IDOR, XSS, CSRF, SQL Injection, and Security Misconfiguration represent the most common entry points attackers exploit and you should master by 2026.
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