-4640 Union All Select Null,null,null,null,'qbqvq'||'lbznmmwdachxaypteqetdoupxsqdsedwqcwkldne'||'qqbqq',null,null,null,null-- Exgp Access

: Scanners look for the unique middle string ( LBzNMMwda... ) surrounded by these markers in the server's response. If it appears, the vulnerability is confirmed. -- ExGP :

: Likely used as an invalid ID to force the original query to return no results, making the injected data the only output. : Scanners look for the unique middle string ( LBzNMMwda

: These act as placeholders to match the exact number of columns expected by the original query. : Scanners look for the unique middle string ( LBzNMMwda