If you found this in your website logs, email subjects, or contact forms, someone (or more likely an automated bot) is . They are looking for "entry points" where user input isn't properly cleaned before being sent to the database. How to protect your data
The text you provided is a classic example of a payload. Specifically, it uses the UNION ALL SELECT statement to attempt to trick a database into revealing unauthorized information or appending malicious data to a legitimate query. What is happening in this string? If you found this in your website logs,
: These are "dummy" values used to match the number of columns in the original database table. If the column counts don't match, the attack fails, so hackers often guess the number of columns this way. Specifically, it uses the UNION ALL SELECT statement