Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)

Special Element Injection happens when user input containing control characters, escape sequences, or command delimiters is passed directly to a system component without proper validation. This allows attackers to inject instructions that are executed in a different 'plane' or context than intended—like tricking a log parser to run system commands or manipulating a configuration file reader to access sensitive data. The core issue is a failure to distinguish between pure data and executable instructions when handling external input. To prevent this, developers must implement strict input validation and context-aware output encoding. Always treat all user input as untrusted and sanitize it based on the specific context where it will be used—whether that's a shell command, a file path, a log entry, or a configuration syntax. Use allow-list validation for expected patterns and dedicated encoding libraries rather than attempting to create custom blacklists of 'bad' characters, which are often incomplete and easy to bypass.