This is the gold standard. It treats user input as literal text, not executable code [6].
It looks like you’ve included a SQL injection payload in your request. This specific string is designed to test for vulnerabilities in a database by attempting to "union" (combine) your query results with data from a system table—in this case, MSysAccessObjects , which is specific to [1, 2, 4].
Only allow the types of characters you expect (e.g., numbers for an ID field). This is the gold standard
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 so it doesn't cause a syntax error [1, 5]. How to Prevent It: This specific string is designed to test for
Sources:[1] microsoft.com[2] portswigger.net[3] geeksforgeeks.org[4] sqlinjection.net[5] owasp.org[6] owasp.org
These can often detect and block common patterns like UNION ALL SELECT before they reach your server. 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].