This is a level 3 challenge on picoCTF this is the link to the challenge.
As soon as you reach the link mentioned in the challenge we get this.
now as per the hint mentioned in the challenge let’s check the source.
now we have to get the cookies.sqlite file so we type the following url and then the file gets downloaded http://shell2017.picoctf.com:30027/private/cookies.sqlite. When we open the file with appropriate application we get this.
now what we need to do is edit the cookie and put the value from cookies.sqlite file into the cookie.
save it and refresh the page we get the flag. Good luck with getting the flag.