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

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

Appends a new set of results to the original query [2, 5].

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

Only allow the types of characters you expect (e.g., numbers for an ID field).

Sources:[1] microsoft.com[2] portswigger.net[3] geeksforgeeks.org[4] sqlinjection.net[5] owasp.org[6] owasp.org If successful, the attacker can see if they

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].

Are you working on or just curious about how these injection patterns work? Attackers use NULL to figure out how many

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