The (1) addfolder and (2) deletefolder functions in neomail-prefs.pl in NeoMail 1.28 do not validate the Session ID, which allows remote attackers to add and delete arbitrary files, when configured with homedirfolders and homedirspools disabled.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24737
http://www.vupen.com/english/advisories/2006/0564
http://www.securityfocus.com/bid/16651
http://sourceforge.net/project/shownotes.php?release_id=392562&group_id=2874