Below is an overview of how this specific payload works and the risks it poses to database security. Understanding the Payload Structure
: This is the SQL comment symbol. It tells the database to ignore the rest of the original, legitimate query that follows the injection point, preventing syntax errors. Below is an overview of how this specific
: In a Union-Based attack, the injected SELECT statement must have the exact same number of columns as the original statement. Attackers use NULL as a placeholder to discover the correct column count without triggering data type errors. : In a Union-Based attack, the injected SELECT
: This operator combines the results of the original query with a new, malicious query. This allows an attacker to retrieve data from other tables that they weren't supposed to see. This allows an attacker to retrieve data from
Implement strict "allow-lists" for user input to ensure it matches the expected format (e.g., only alphanumeric characters).