Free Realty contains a flaw that may allow an attacker to carry out an SQL injection attack. The issue is due to the propview.php script not properly sanitizing user-supplied input to the 'sort' variable. This may allow an attacker to inject or manipulate SQL queries in the back-end database.
Upgrade to version 2.9-0.7.2-full or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.