: They can bypass login screens by injecting code that always evaluates to "True."
If an application is susceptible to this payload, it means the developer is not properly or using parameterized queries . This leads to several critical risks:
: These are placeholders. For a UNION attack to work, the second query must have the exact same number of columns as the first. Attackers use NULL to test and match the column count without causing data type errors.
Are you currently , or
: Attackers can replace the NULL values with table names (like users or passwords ) to steal the entire database.