An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.
Exploitability
AV:NAC:HPR:NUI:NScope
S:CImpact
C:LI:LA:N5.4/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:NOther