core/email_api.php in MantisBT before 1.2.12 does not properly manage the sending of e-mail notifications about restricted bugs, which might allow remote authenticated users to obtain sensitive information by adding a note to a bug before losing permission to view that bug.

MantisBT before 1.2.12 does not use an expected default value during decisions about whether a user may modify the status of a bug, which allows remote authenticated users to bypass intended access restrictions and make status changes by leveraging a blank value for a per-status setting.

MantisBT before 1.2.9 does not audit when users copy or clone a bug report, which makes it easier for remote attackers to copy bug reports without detection.

The mci_check_login function in api/soap/mc_api.php in the SOAP API in MantisBT before 1.2.9 allows remote attackers to bypass authentication via a null password.

The SOAP API in MantisBT before 1.2.9 does not properly enforce the bugnote_allow_user_edit_delete and delete_bug_threshold permissions, which allows remote authenticated users with read and write SOAP API privileges to delete arbitrary bug reports and bug notes.

MantisBT before 1.2.9 does not properly check permissions, which allows remote authenticated users with manager privileges to (1) modify or (2) delete global categories.

The access_has_bug_level function in core/access_api.php in MantisBT before 1.2.9 does not properly restrict access when the private_bug_view_threshold is set to an array, which allows remote attackers to bypass intended restrictions and perform certain operations on private bug reports.

bug_actiongroup.php in MantisBT before 1.2.9 does not properly check the report_bug_threshold permission of the receiving project when moving a bug report, which allows remote authenticated users with the report_bug_threshold and move_bug_threshold privileges for a project to bypass intended access restrictions and move bug reports to a different project.

MantisBT before 1.2.11 does not check the delete_attachments_threshold permission when form_security_validation is set to OFF, which allows remote authenticated users with certain privileges to bypass intended access restrictions and delete arbitrary attachments.

The mc_issue_note_update function in the SOAP API in MantisBT before 1.2.11 does not properly check privileges, which allows remote attackers with bug reporting privileges to edit arbitrary bugnotes via a SOAP request.