{keyword}') Union All Select Null,null,null,null,null,null,null-- Hofz -

The string you provided is a . Specifically, it is designed to exploit a vulnerability in a database-driven application to extract unauthorized data.

: Use parameterized queries so that user input is never executed as code. The string you provided is a

: This is likely a "canary" or a unique identifier used by automated security scanners to confirm if the injection was successful. What should you do? : This is likely a "canary" or a

: This is the core of the attack. It tells the database to combine the results of the legitimate query with the results of a new, malicious one. It tells the database to combine the results

: This is a SQL comment. It tells the database to ignore everything that follows it (like the original developer's remaining code), which prevents the rest of the legitimate query from causing a syntax error.

: A WAF can often block these types of patterned attacks automatically.