• {keyword}) Union All Select Null,null,null,null,null,null# May 2026

    : This part attempts to "break out" of the existing SQL command. The closing parenthesis ) is used to close a function or a nested query that the developer originally intended.

    : This is the core of the attack. The UNION operator combines the results of two or more SELECT statements into a single result set. ALL ensures that duplicate rows are kept. {KEYWORD}) UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL#

    To protect your application from this type of attack, you should avoid building queries using simple string concatenation. Instead, use: : This part attempts to "break out" of

    : Most modern frameworks like Hibernate or Entity Framework handle this protection automatically. The UNION operator combines the results of two

    : This is a common reconnaissance technique. An attacker uses NULL values to determine the exact number of columns returned by the original query. If the number of NULL s doesn't match the original column count, the database will usually throw an error. By adding or removing NULL s, an attacker can find the correct structure.

: This part attempts to "break out" of the existing SQL command. The closing parenthesis ) is used to close a function or a nested query that the developer originally intended.

: This is the core of the attack. The UNION operator combines the results of two or more SELECT statements into a single result set. ALL ensures that duplicate rows are kept.

To protect your application from this type of attack, you should avoid building queries using simple string concatenation. Instead, use:

: Most modern frameworks like Hibernate or Entity Framework handle this protection automatically.

: This is a common reconnaissance technique. An attacker uses NULL values to determine the exact number of columns returned by the original query. If the number of NULL s doesn't match the original column count, the database will usually throw an error. By adding or removing NULL s, an attacker can find the correct structure.

{KEYWORD}) UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL#

This project has been funded with support from the European Commission. This publication [communication] reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.

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