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{KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL-- Uizf

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: In some cases, these injections can be used to log in without a valid password.

: This is likely a random string used as a unique identifier or "signature" to help the attacker find their specific test result in a large log file or report. Purpose of Such a Payload Attackers use this technique to:

This string is a classic example of a , specifically a Union-Based SQLi attack . It is used by attackers to test for vulnerabilities or extract data from a database. Breakdown of the Payload

If you found this in a "complete report" (such as a security scan or a web server log), it indicates that an automated tool or a manual actor has the system.