Horde IMP 4.3.6 and earlier does not request that the web browser avoid DNS prefetching of domain names contained in e-mail messages, which makes it easier for remote attackers to determine the network location of the webmail user by logging DNS requests.

Cross-site scripting (XSS) vulnerability in the inline MIME viewer in Horde-IMP (Internet Messaging Program) 3.2.4 and earlier, when used with Internet Explorer, allows remote attackers to inject arbitrary web script or HTML via an e-mail message.

Unknown vulnerability in Horde IMP 3.2.3 and earlier, before a "security fix," does not properly validate input, which allows remote attackers to execute arbitrary script as other users via script or HTML in an e-mail message, possibly triggering a cross-site scripting (XSS) vulnerability.

Horde IMP 4.0.4 and earlier does not sanitize strings containing UTF16 null characters, which allows remote attackers to conduct cross-site scripting (XSS) attacks via UTF16 encoded attachments and strings that will be executed when viewed using Internet Explorer, which ignores the characters.

Cross-site scripting (XSS) vulnerability in horde/imp/search.php in Horde IMP H3 before 4.1.3 allows remote attackers to include arbitrary web script or HTML via multiple unspecified vectors related to folder names, as injected into the vfolderlabel form field in the IMP search screen.

Argument injection vulnerability in the cleanup cron script in Horde Project Horde and IMP before Horde Application Framework 3.1.4 allows local users to delete arbitrary files and possibly gain privileges via multiple space-delimited pathnames.

Cross-site scripting (XSS) vulnerability in fetchmailprefs.php in Horde IMP before 4.3.8, and Horde Groupware Webmail Edition before 1.2.7, allows remote attackers to inject arbitrary web script or HTML via the fmid parameter in a fetchmailprefssave action, related to the Fetchmail configuration.