blocks/shoutbox_block.php in BtiTracker 1.4.4 does not verify user accounts, which allows remote attackers to post shoutbox entries as arbitrary users via a modified nick field.
https://exchange.xforce.ibmcloud.com/vulnerabilities/38417
http://www.securityfocus.com/bid/26551
http://sourceforge.net/tracker/index.php?func=detail&aid=1764809&group_id=146822&atid=766508
http://sourceforge.net/project/shownotes.php?release_id=552477