{keyword}' Union All Select Null,null,null,null,null,null,null,null From Msysaccessobjects-- Udhz May 2026

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

These can often detect and block common patterns like UNION ALL SELECT before they reach your server. Comments out the rest of the original query

A system table in Access that contains information about database objects. If successful, the attacker can see if they have access to system metadata [1, 4]. 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