Kanboard is project management software that focuses on the Kanban methodology. The vuln is in app/Controller/ProjectPermissionController.php function addUser(). The users permission to add users to a project only get checked on the URL parameter project_id. If the user is authorized to add users to this project the request gets processed. The users permission for the POST BODY parameter project_id does not get checked again while processing. An attacker with the 'Project Manager' on a single project may take over any other project. The vulnerability is fixed in 1.2.37.