SQL Injection is a security vulnerability that allows an attacker to manipulate the SQL queries used by an application. It occurs when user input is improperly handled and incorporated directly into SQL queries, allowing the attacker to execute arbitrary SQL commands. This can lead to various malicious activities, such as retrieving, modifying, or deleting data from the database, bypassing authentication, and even gaining administrative privileges. Example of SQL Injection: A vulnerable query might look like this: $query = "SELECT * FROM users WHERE username = ' $username ' AND password = ' $password '" ; If the attacker enters ' OR '1'='1' for both the username and password fields, the query becomes: SELECT * FROM users WHERE username = '' OR '1' = '1' AND password = '' OR '1' = '1' ; This will always return true, potentially allowing unauthorized access to the system. How to Pr...
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