Bludit before 3.9.0 allows remote code execution for an authenticated user by uploading a php file while changing the logo through /admin/ajax/upload-logo.
Bludit prior to 3.9.1 allows a non-privileged user to change the password of any account, including admin. This occurs because of bl-kernel/admin/controllers/user-password.php Insecure Direct Object Reference (a modified username POST parameter).