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 vfolder_label form field in the IMP search screen.

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 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.