: Restrict search inputs to a reasonable character length and filter out common SQL keywords.

The query asks the database: "If the first characters of a system user name equal 'ykFj', is that equal to 'gpWr'?" Since these strings do not match, the query is likely being used as a test. An attacker monitors whether the application's response changes (e.g., a different error message or a successful page load) based on whether the injected condition evaluates to true or false. How to Protect Your Site

: This wraps the malicious query in a way that attempts to maintain valid SQL syntax by closing existing quotes and ensuring the final condition ( 'mppV'='mppV' ) is always true.

CHAR(103)||CHAR(112)||CHAR(87)||CHAR(114) translates to .