Redmine before 4.0.8 and 4.1.x before 4.1.2 allows attackers to bypass the addissuenotes permission requirement by leveraging the Issues API.

Redmine before 4.0.8 and 4.1.x before 4.1.2 allows attackers to discover the names of private projects if issue-journal details exist that have changes to projectid values.

Insufficient input validation in the Git repository integration of Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows Redmine users to read arbitrary local files accessible by the application server process.

Redmine before 4.0.7 and 4.1.x before 4.1.1 has XSS via the backurl field.

Redmine 4.1.x before 4.1.2 allows XSS because an issue's subject is mishandled in the auto complete tip.

Redmine before 4.0.7 and 4.1.x before 4.1.1 has stored XSS via textile inline links.

Redmine before 4.0.7 and 4.1.x before 4.1.1 allows attackers to discover the subject of a non-visible issue by performing a CSV export and reading time entries.

Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows users to circumvent the allowed filename extensions of uploaded attachments.

Redmine before 4.0.9, 4.1.x before 4.1.3, and 4.2.x before 4.2.1 allows attackers to bypass the addissuenotes permission requirement by leveraging the incoming mail handler.

Redmine before 4.0.9 and 4.1.x before 4.1.3 allows an attacker to learn the values of internal authentication keys by observing timing differences in string comparison operations within SysController and MailHandlerController.