There are several vulnerabilities in this plugin.
First vulnerability type is path disclosure. The issue exists due to failure in the "/wp-content/plugins/comment-rating/comment-rating-options.php" script. There is possible to generate an error which will disclose the full path of the script. In this way an attacker can approach potentially information.
Second vulnerability type is SQL injection. The vulnerability exists because of failure in the "/wp-content/plugins/comment-rating/ck-processkarma.php" script to properly clean up user-supplied input in "id" variable. It allows an attacker to modify data, alter queries to the application SQL database, compromise the access and application or exploit hidden vulnerabilities in the underlying database.