PostgreSQL versions 8.4 - 9.6 are vulnerable to information leak in pg_user_mappings view which discloses foreign server passwords to any user having USAGE privilege on the associated foreign server.
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
security.gentoo.org/glsa/201710-06
www.postgresql.org/about/news/1746/