Roundcube 1.5.x before 1.5.6 and 1.6.x before 1.6.5 allows XSS via a Content-Type or Content-Disposition header (used for attachment preview or download). https://github.com/roundcube/roundcubemail/commit/5ec496885e18ec6af956e8c0d627856c2257ba2d https://github.com/roundcube/roundcubemail/releases/tag/1.5.6 https://github.com/roundcube/roundcubemail/releases/tag/1.6.5
Created roundcubemail tracking bugs for this issue: Affects: fedora-all [bug 2248089]