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://www.debian.org/security/2023/dsa-5572
https://lists.debian.org/debian-lts-announce/2023/12/msg00005.html
https://github.com/roundcube/roundcubemail/releases/tag/1.6.5
https://github.com/roundcube/roundcubemail/releases/tag/1.5.6
https://github.com/roundcube/roundcubemail/commit/5ec496885e18ec6af956e8c0d627856c2257ba2d