CVE-2026-54432: Roundcube Webmail

Medium severity, CVSS 4.7. EPSS: 0.2% chance of exploitation in the next 30 days.

Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2 allows Stored Cross-Site Scripting (XSS). The issue occurs because the attachment MIME type is not properly escaped on the attachment-validation warning page.

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 2026-07-15.