In Redmine before 3.2.8, 3.3.x before 3.3.5, and 3.4.x before 3.4.3, XSS exists in app/helpers/application_helper.rb via a multi-value field with a crafted value that is mishandled during rendering of issue history.
In Redmine before 3.2.8, 3.3.x before 3.3.5, and 3.4.x before 3.4.3, XSS exists in app/helpers/queries_helper.rb via a multi-value field with a crafted value that is mishandled during rendering of an issue list.
In Redmine before 3.2.6 and 3.3.x before 3.3.3, remote attackers can obtain sensitive information (password reset tokens) by reading a Referer log, because account/lost_password does not use a redirect.
In Redmine before 3.2.6 and 3.3.x before 3.3.3, Redmine.pm lacks a check for whether the Repository module is enabled in a project's settings, which might allow remote attackers to obtain sensitive differences information or possibly have unspecified other impact.
Redmine before 3.2.6 and 3.3.x before 3.3.3 mishandles Time Entry rendering in activity views, which allows remote attackers to obtain sensitive information.