Unknown · Roundcube Webmail · CVE-2026-35544
Name of the Vulnerable Software and Affected Versions
Roundcube Webmail versions prior to 1.5.14 and prior to 1.6.14
Description
A flaw exists in Roundcube Webmail that stems from inadequate sanitization of Cascading Style Sheets (CSS) within HTML email messages. This can allow for a bypass of existing mitigations through the use of the '!important' declaration in CSS.
Recommendations
Update Roundcube Webmail to version 1.5.14 or later.
Update Roundcube Webmail to version 1.6.14 or later.