Froxlor through 0.10.22 does not perform validation on user input passed in the customermail GET parameter. The value of this parameter is reflected in the login webpage, allowing the injection of arbitrary HTML tags.
An issue was discovered in Froxlor through 0.10.15. The installer wrote configuration parameters including passwords into files in /tmp, setting proper permissions only after writing the sensitive data. A local attacker could have disclosed the information if he read the file at the right time, because of _createUserdataConf in install/lib/class.FroxlorInstall.php.