CVE-2026-40018: Open-Xchange GmbH Ox Dovecot CE

High severity, CVSS 7.4. EPSS: 0.3% chance of exploitation in the next 30 days.

None None None No publicly available exploits are known.

Affected products

• Open-Xchange GmbH Ox Dovecot CE: from 2.3.0, before 2.4.5 (fixed in 2.4.5)
• Open-Xchange GmbH Ox Dovecot Pro: from 2.3.0, before 3.1.6 (fixed in 3.1.6)

Published 2026-08-28. Last modified 2026-09-03.