Multiple SQL injection vulnerabilities in calendar.php in BosDates 4.0 and earlier allow remote attackers to execute arbitrary SQL commands via the (1) year and (2) category parameters.
http://www.vupen.com/english/advisories/2005/2632
http://secunia.com/advisories/17752
http://pridels0.blogspot.com/2005/11/bosdates-v40-sql-vuln.html