An issue was discovered in Couchbase Server before 7.2.4. ns_server admin credentials are leaked in encoded form in the diag.log file. The earliest affected version is 7.1.5.
https://www.couchbase.com/alerts/
https://forums.couchbase.com/tags/security
https://docs.couchbase.com/server/current/release-notes/relnotes.html