PostgreSQL is vulnerable to information disclosure vulnerability. The pg_user_mappings access qualifications are not properly implemented. A remote authenticated user may be able to view foreign server passwords which leads to data modification.
www.debian.org/security/2017/dsa-3851
www.securityfocus.com/bid/98460
www.securitytracker.com/id/1038476
access.redhat.com/errata/RHSA-2017:1677
access.redhat.com/errata/RHSA-2017:1678
access.redhat.com/errata/RHSA-2017:1838
access.redhat.com/errata/RHSA-2017:1983
access.redhat.com/errata/RHSA-2017:2425
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=1452734
security.gentoo.org/glsa/201710-06
www.postgresql.org/about/news/1746/
www.postgresql.org/docs/current/static/release-9-5-5.html
www.postgresql.org/docs/current/static/release-9-5-6.html
www.postgresql.org/docs/current/static/release-9-5-7.html