@hashtagdeg said:
Someone give me a nudge please.
I changed a param by burp, and it took me into a special page, throught that page I saw souce code error messsages and some important information, but I don’t know what should I do next. Thx.
Try to find out more about what you see 
@LiamKRP said:
Can someone help me with the inital foothold? I got into the “secret” page and saw some interesting info, researched some things and tried some exploits with no luck.
Could someone pm me pls?
You’re on the right track.
You either need to dig further, or check the exploits’ params