Connecting

mongo --host mongodb0.example.com --port 28015
or for authentication: mongo --username alice --password --authenticationDatabase admin --host mongodb0.examples.com --port 28015.

Querying / Exploiting

to show all databases: show dbs, then use dbname to select the db you want.

to see all inside the db, use show collections.

Finally use db.collectionName.find() (usually db.admin.find(), or can use mongo --port 27117 dbname --eval "db.admin.find().forEach(printjson);")