This Metasploit module exploits a vulnerability in the 'proc_deutf()' function defined in /includes/functions_vbseocp_abstract.php in vBSEO versions 3.6.0 and below. User input passed through 'char_repl' POST parameter is not properly sanitized before being used in a call to preg_replace() function which uses the 'e' modifier. This can be exploited to inject and execute arbitrary code leveraging the PHP's complex curly syntax.