CVE-2026-62643: Roundcube Webmail

Critical severity, CVSS 10.0. EPSS: 0.2% chance of exploitation in the next 30 days.

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, 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. NOTE: this issue exists because of insufficient fixes for CVE-2026-35540 and CVE-2026-48843.

Affected products

• Roundcube Webmail: from 1.6.0, before 1.6.17 (fixed in 1.6.17); from 1.7.0, before 1.7.2 (fixed in 1.7.2)

Published 2026-07-14. Last modified 2026-07-20.