CVE-2026-62644: Roundcube Webmail

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the password plugin of the Roundcube Webmail was subject to username spoofing via session data, which could lead to account takeover.

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.