WordPress Plugin Lead Octopus Power - 'id' SQL Injection

source: https://www.securityfocus.com/bid/68934/info

The Lead Octopus Power plugin for WordPress is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query.

A successful exploit may allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database. 

http://www.example.com/wp-content/plugins/Lead-Octopus-Power/lib/optin/optin_page.php?id=[SQL]