Announce of Horde 3.0.7 (final):
This [3.0.7] is a security release that fixes cross site scripting vulnerabilities in two of Horde's MIME viewers. These holes could for example be exploited by an attacker sending specially crafted emails to Horde's webmail client IMP. The attack could be used to steal users' identity information, taking over users' sessions, or changing users' settings. As a hotfix the css and tgz MIME drivers can be disabled by removing their entries from the $mime_drivers_map['horde']['registered'] list in horde/config/mime_drivers.php.