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.
Debian Linux Security Advisory 3529-1 - Multiple vulnerabilities have been found in Redmine, a project management web application, which may result in information disclosure.