BosDates contains a flaw that may allow an attacker to carry out an SQL injection attack. The issue is due to the calendar.php script not properly sanitizing user-supplied input to the 'year' and 'category' variables. This may allow an attacker to inject or manipulate SQL queries in the back-end database.
Currently, there are no known workarounds or upgrades to correct this issue. However, BosDates has released a patch to address this vulnerability.