The Issues API in Redmine before 2.6.8, 3.0.x before 3.0.6, and 3.1.x before 3.1.2 allows remote authenticated users to obtain sensitive information in changeset messages by leveraging permission to read issues with related changesets from other projects.
www.debian.org/security/2016/dsa-3529
www.securityfocus.com/bid/78621
github.com/redmine/redmine/commit/8d8f612fa368a72c56b63f7ce6b7e98cab9feb22
www.redmine.org/issues/21136
www.redmine.org/projects/redmine/wiki/Changelog_3_0
www.redmine.org/projects/redmine/wiki/Changelog_3_1
www.redmine.org/versions/105