💉 SQL Injection: When Hackers Talk Directly to Your Database
SQL Injection (SQLi) is one of the oldest and most dangerous web vulnerabilities. It allows attackers to manipulate database queries, steal data, bypass logins, or even delete entire databases — all through a simple input field.
🧠 What Is SQL Injection?
SQL Injection happens when an attacker inputs malicious SQL code into a web form, URL, or search box. If the application doesn’t properly sanitize input, that code is executed by the database — giving the attacker direct access.
⚙️ How It Works
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A website asks for user input (e.g., username, ID, search)
The input is directly used in an SQL query without validation
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The attacker injects SQL code like
' OR '1'='1 -
The query is altered to always be true — bypassing checks or exposing data
🔥 What Can SQLi Do?
- 🔓 Bypass authentication/login pages
- 📁 Access, modify, or delete sensitive data
- 🗄️ Dump entire databases (usernames, passwords, credit cards)
- 💣 Gain admin access or execute remote code
🛡️ How to Prevent SQL Injection
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✅ Use prepared statements or parameterized queries
🔒 Escape and sanitize all user input
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📦 Use ORM frameworks with built-in protection
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🚫 Never trust data from users — validate everything
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📊 Monitor logs for suspicious query patterns
🧪 Real-World Impact
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2012: LinkedIn breach leaked millions of user credentials
Sony Pictures, Heartland Payment Systems, and others suffered major SQLi-based attacks
✅ Final Thoughts
SQL Injection is simple but devastating. One vulnerable input field can open the door to total system compromise.
Secure your code — or someone else will exploit it.