A security issue has been discovered in Couchbase Server before 7.6.4 and fixed in v.7.6.4 and v.7.2.7 for Windows that could allow unauthorized access to sensitive files. Depending on the level of privileges, this vulnerability may grant access to files such as /etc/passwd or /etc/shadow.
https://www.couchbase.com/alerts/
https://forums.couchbase.com/tags/security
https://docs.couchbase.com/server/current/release-notes/relnotes.html