{keyword}' Union All Select Null,null,null,null,null,null,null,null From Msysaccessobjects-- Udhz -

Comments out the rest of the original query so it doesn't cause a syntax error [1, 5]. How to Prevent It:

Only allow the types of characters you expect (e.g., numbers for an ID field). Comments out the rest of the original query

Are you working on or just curious about how these injection patterns work? Comments out the rest of the original query

Sources:[1] microsoft.com[2] portswigger.net[3] geeksforgeeks.org[4] sqlinjection.net[5] owasp.org[6] owasp.org Comments out the rest of the original query

Matches the number of columns in the original table. Attackers use NULL to figure out how many columns they need to match without causing a data type error [2, 3].

Breaks out of the intended data field in a SQL query.

These can often detect and block common patterns like UNION ALL SELECT before they reach your server.