TeamPass before 3.1.3.1 does not properly check whether a mail_me (aka action_mail) operation is on behalf of an administrator or manager.
Lack of authorization controls in REST API functions in TeamPass through 2.1.27.36 allows any TeamPass user with a valid API token to become a TeamPass administrator and read/modify all passwords via authenticated api/index.php REST API calls. NOTE: the API is not available by default.