Here’s a full educational write-up on the search operator, specifically focusing on ID-based parameter vulnerabilities , with a note on “upd” (likely indicating an update or edit parameter).
http://target.com/article.php?id=1 UNION SELECT username,password FROM users -- inurl php id1 upd
Many automated hacking tools use "dork lists" to find thousands of vulnerable targets in seconds. inurl:php?id=1 is often the first line in these lists because it identifies sites with dynamic content that are likely connected to a SQL database. The "UPD" Suffix Here’s a full educational write-up on the search
Here is an informative breakdown of the feature and the logic behind this specific query: specifically focusing on ID-based parameter vulnerabilities
$id = $_GET['id1']; $sql = "SELECT * FROM logs WHERE ref='upd' AND user=$id";
$query = "SELECT * FROM users WHERE id = '$id'";