Language: PHP
Label: vulnerable
CWE: CWE-94 \u2014 Improper Control of Generation of Code ('Code Injection')
The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

Code:
    private function _getMyUniqueHash()
    {
        $unique = $this->getServer('REMOTE_ADDR');
        $unique .= $this->getServer('HTTP_USER_AGENT');
        $unique .= $this->getServer('HTTP_ACCEPT_LANGUAGE');
        $unique .= C_USER;
        return md5($unique);
    }