mod_css_styles in Roundcube through 1.5.7 and 1.6.x through 1.6.7 insufficiently filters Cascading Style Sheets (CSS) token sequences in rendered e-mail messages, allowing a remote attacker to obtain sensitive information.
https://www.helpnetsecurity.com/2024/08/07/cve-2024-42009-cve-2024-42008/
https://roundcube.net/news/2024/08/04/security-updates-1.6.8-and-1.5.8
https://github.com/roundcube/roundcubemail/releases/tag/1.6.8
https://github.com/roundcube/roundcubemail/releases/tag/1.5.8