Which type of security vulnerability allows attackers to manipulate SQL queries?

SQL injection is a type of security vulnerability that allows attackers to manipulate SQL queries executed by a web application's database. By injecting malicious SQL code into input fields, attackers can exploit this vulnerability to bypass authentication, extract sensitive information, modify or delete data, and perform other unauthorized actions on the database. Preventing SQL injection requires implementing proper input validation, using parameterized queries, and employing other security best practices.