PHP file inclusion vulnerability in protection.php in CodeGrrl (a) PHPCalendar 1.0, (b) PHPClique 1.0, (c) PHPCurrently 2.0, (d) PHPFanBase 2.1, and (e) PHPQuotes 1.0 allows remote attackers to include arbitrary local files via the siteurl parameter when register_globals is enabled.  NOTE: It was later reported that PHPFanBase 2.2 is also affected.