In Rukovoditel 2.5.2, there is a stored XSS vulnerability on the configuration page via the copyright text input. Thus, an attacker can inject a malicious script to steal all users' valuable data. This copyright text is on every page so this attack vector can be very dangerous.
In Rukovoditel 2.5.2, attackers can upload arbitrary file to the server by just changing the content-type value. As a result of that, an attacker can execute a command on the server. This specific attack only occurs without the Maintenance Mode setting.
In Rukovoditel 2.5.2 has a form_session_token value to prevent CSRF attacks. This protection mechanism can be bypassed with another user's valid token. Thus, an attacker can change the Admin password by using a CSRF attack and escalate his/her privileges.
A file-upload vulnerability exists in Rukovoditel 2.3.1. index.php?module=configuration/save allows the user to upload a background image, and mishandles extension checking. It accepts uploads of PHP content if the first few characters match GIF data, and the filename ends in ".php" with mixed case, such as the .pHp extension.