CVE-2020-13965: Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Medium severity, CVSS 6.1. Actively exploited: in CISA KEV since 2024-06-26. EPSS: 76.6% chance of exploitation in the next 30 days.

An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. There is XSS via a malicious XML attachment because text/xml is among the allowed types for a preview.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 31 only; version 32 only
• Roundcube Webmail: before 1.3.12 (fixed in 1.3.12); from 1.4.0, before 1.4.5 (fixed in 1.4.5)

Published 2020-06-09. Last modified 2026-06-17.