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The string you provided is a classic payload. It is not a feature of a specific software product but rather a technique used by security researchers and attackers to probe databases for vulnerabilities. Purpose of the Payload
: This is a SQL comment marker that tells the database to ignore the rest of the original query, preventing errors from leftover code. How it Works
Once an attacker knows there are 8 columns, they can replace the NULL values with commands to extract sensitive data, such as usernames, passwords, or database versions. SQL injection UNION attacks | Web Security Academy The string you provided is a classic payload
: Attackers use NULL because it is compatible with almost every data type (integers, strings, dates), making it the "safest" way to avoid syntax errors while testing column counts.
: This command attempts to append a new set of results to the original query's output. How it Works Once an attacker knows there
: An attacker starts with one NULL and keeps adding more (e.g., NULL, NULL , then NULL, NULL, NULL ).
: If the number of NULL values does not match the original query's column count, the server usually returns an error (like a 500 Internal Server Error). : An attacker starts with one NULL and keeps adding more (e
: This represents the original input (like a product category or search term) that the application expects.