An authenticated attacker can inject malicious code into "lang" parameter in /uno/central.php file in CMSuno 1.6.2 and run this PHP code in the web page. In this way, attacker can takeover the control of the server.
CMSUno version 1.6.2 authenticated remote code execution exploit. The original discovery for the vulnerability leveraged is attributed to Fatih Celik in November of 2020.