It was found that MongoDB creates a world-readable .dbshell history file in a user's directory:

The mongodb client doesn't store authentication commands, but there's still information leakage, though, even if only about database and collection names, or data structure.

As for data itself, the history could also contain sensitive information; for instance, if usernames for some other service were stored in a mongo collection, the history could contain lines like:

db.users.find({user:"foo"})

or even:

db.users.update({user:"foo"},{$set:{password:"OhComeOnNow"}})

Upstream bug (closed as "Works as Designed"):

https://jira.mongodb.org/browse/SERVER-25335

CVE request:

http://seclists.org/oss-sec/2016/q3/199