CWE-89 (SQL命令中使用的特殊元素转义处理不恰当(SQL注入)) — Vulnerability Class 9921

CWE-89 represents a critical input validation weakness where software constructs SQL commands using untrusted data without properly sanitizing special characters. Attackers typically exploit this vulnerability by injecting malicious SQL syntax into user-facing inputs, such as login fields or search queries, to manipulate the database’s behavior. This exploitation can lead to unauthorized data access, data modification, or complete system compromise by bypassing authentication or executing arbitrary commands. Developers mitigate this risk by implementing strict input validation and, most effectively, using parameterized queries or prepared statements. These techniques ensure that user input is treated strictly as data rather than executable code, thereby preventing the injection of malicious SQL elements. By separating code logic from data inputs, applications maintain integrity and protect sensitive information from unauthorized manipulation.