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 projectid. If the user is authorized to add users to this project the request gets processed. The users permission for the POST BODY parameter projectid 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.