{keyword}' And (select Char(121)||char(107)||char(70)||char(106) From Information_schema.system_users)=char(103)||char(112)||char(87)||char(114) And 'mppv'='mppv -

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

: These functions convert ASCII numeric codes into text characters. : Restrict search inputs to a reasonable character

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 : Use a WAF to automatically block requests

: 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. : Restrict search inputs to a reasonable character

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

: Use a WAF to automatically block requests containing known SQL injection patterns.