CRLF injection vulnerability in inc/function.php in MyBulletinBoard (MyBB) 1.04 allows remote attackers to conduct cross-site scripting (XSS), poison caches, or hijack pages via CRLF (%0A%0D) sequences in the Referrer HTTP header field, possibly when redirecting to other web pages.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25267
http://www.securityfocus.com/archive/1/427747/100/0/threaded