The Beryo 2.0 version contains a vulnerability that allows remote attackers to disclose files from the server. By manipulating the 'chemin' parameter in the 'downloadpic.php' script, an attacker can traverse the directory structure and access sensitive files such as the password file ('/etc/passwd'). The vulnerability can be exploited by sending a crafted request to the server with the appropriate path traversal sequence in the parameter value.