{keyword}') Union All Select Null,null,null,null,null,null,null,null-- Mxyc May 2026

The text ') UNION ALL SELECT NULL,NULL...-- is a malicious payload used to test for vulnerabilities in a database.

If a website is vulnerable to this, an attacker doesn't just stop at NULL . They eventually replace those NULL s with commands to extract sensitive info—like your —and display them right on the screen where the "Keyword" results should have been. How Developers Stop This The text ') UNION ALL SELECT NULL,NULL

: This is the heart of the attack. It tells the database to combine the results of the original (legitimate) search with a new set of data the attacker wants to see. How Developers Stop This : This is the heart of the attack

It looks like you've included a in your request. In the world of cybersecurity, that specific snippet is a classic example of an "Union-based" attack. In the world of cybersecurity, that specific snippet

: Attackers use NULL to figure out exactly how many columns the original database table has. If the number of NULL s matches the columns, the page loads; if not, it crashes.

: This attempts to "break out" of the developer’s intended code by closing a data field and a function.