{keyword} And (select 8148 From(select Count(*),concat(0x7162717671,(select (elt(8148=8148,1))),0x7171627171,floor(rand(0)*2))x From Information_schema.character_sets Group By X)a)-- Qkgc -

like usernames, hashed passwords, or emails. How to Prevent It

The snippet you provided is a classic example of an attack. like usernames, hashed passwords, or emails

Only allow the types of characters you expect. If a user is searching for a "Keyword," they probably don't need to use parentheses or semicolons. If a user is searching for a "Keyword,"

These are hexadecimal representations of characters (like 'qbqvq') used as delimiters so the attacker can easily spot their "stolen" data in the middle of a messy error message. Why is it dangerous? It looks like your query contains some SQL

It looks like your query contains some SQL injection syntax ( SELECT COUNT , CONCAT , INFORMATION_SCHEMA ). If you're looking for an on how these types of database queries work—specifically regarding web security and SQL injection (SQLi) —I can certainly help with that. What is this code?