source: https://www.securityfocus.com/bid/63217/info
WP-Realty plugin for WordPress is prone to an SQL-injection vulnerability because the application fails to properly sanitize user-supplied input before using it in an SQL query.
A successful exploit could allow an attacker to compromise the application, access or modify data, or exploit vulnerabilities in the underlying database.
http://www.example.com/wordpress/wp-content/plugins/wp-realty/index_ext.php?action=contact_friend&popup=yes&listing_id=[SQLi]
http://www.example.com/wordpress/wp-content/plugins/wp-realty/index_ext.php?action=contact_friend&popup=yes&listing_id=[SQLi