A cross-site scripting (XSS) vulnerability in MantisBT 1.2.14 allows remote attackers to inject arbitrary web script or HTML via a version, related to deleting a version.

MantisBT 1.2.12 before 1.2.15 allows authenticated users to by the workflow restriction and close issues.

An access control issue in MantisBT before 1.2.13 allows users with "Reporter" permissions to change any issue to "New".

MantisBT 1.2.x before 1.2.2 insecurely handles attachments and MIME types. Arbitrary inline attachment rendering could lead to cross-domain scripting or other browser attacks.

An issue was discovered in MantisBT before 2.24.5. It associates a unique cookie string with each user. This string is not reset upon logout (i.e., the user session is still considered valid and active), allowing an attacker who somehow gained access to a user's cookie to login as them.