source: http://www.securityfocus.com/bid/16130/info

Jax Calendar is prone to an SQL injection vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input before using it in an SQL query.

Successful exploitation could result in a compromise of the application, disclosure or modification of data, or may permit an attacker to exploit vulnerabilities in the underlying database implementation.

Version 1.34 and prior are affected; other versions may also be vulnerable. 

http://www.example.com/jax_calendar.php?Y=2005&m=11&d=15&cal_id=[SQL] 