If the developer does not sanitize (clean) or parameterize these inputs, an attacker can manipulate the pk or id value to execute their own SQL commands.
Before diving into the specific keyword "pk," it is essential to understand the mechanics of the operator. The inurl: command forces Google to look at the (the web address) rather than the body text of the page. inurl pk id 1
?id=1 AND 1=1 (normal response) ?id=1 AND 1=2 (different or empty response) If the developer does not sanitize (clean) or
If the application takes id=1 and concatenates it directly into a database query (e.g., SELECT * FROM users WHERE id = 1 ), an attacker will change the URL to id=1' or id=1 OR 1=1 . If the application throws a database error or behaves unexpectedly, the attacker knows they can inject malicious SQL commands to extract the entire database. inurl pk id 1