Hi, Horde IMP v4.3.7 and lower are subject to a cross site scripting (XSS) vulnerability: The fetchmailprefs.php script fails to properly sanitize user supplied input to the 'fm_id' URL parameter. If exploited, injected code will be persistent (persistent XSS) and will execute once the user (manually) accesses mail fetching preferences. The following URL can be used as a proof of concept: > [path_to_horde_imp]/fetchmailprefs.php?actionID=fetchmail_prefs_save&fm_driver=imap&fm_id=zzz%22%3E%3Cscript%3Ealert%28%27XSS%27%29%3C%2Fscript%3E%3Cx+y%3D%22&fm_protocol=pop3&fm_lmailbox=INBOX&save=Create Prior authentication to IMP is required for immediate exploitation. Follow-up authentication is also possible if the victims' IMP configuration has folder maintenance options disabled. This issue has been fixed by Jan Schneider of the Horde Project: > http://git.horde.org/diff.php/imp/fetchmailprefs.php?rt=horde&r1=1.39.4.10&r2=1.39.4.11 According to him, Horde IMP v4.3.8 (or a release candidate) which fixes this issue is to be released within the week. Release announcements will likely be communicated through http://lists.horde.org/mailman/listinfo/announce Credits for this discovery: Moritz Naumann Naumann IT Security Consulting, Berlin, Germany http://moritz-naumann.com Thanks for reading, Moritz -- Naumann IT Security Consulting Samariterstr. 16 10247 Berlin Germany Web http://moritz-naumann.com GPG http://moritz-naumann.com/keys/0x277F060C.asc 17FE F47E CE81 FC3A 8D6C 85A0 9FA1 A4BD 277F 060C Inhaber: Moritz Naumann ? StNr. 22/652/12010 ? USt-IdNr. DE266365097