CVE-2025-30189: Open-Xchange GmbH Ox Dovecot Pro

High severity, CVSS 7.4. EPSS: 0.6% chance of exploitation in the next 30 days.

When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users. After cached login, all subsequent logins are for same user. Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers. No publicly available exploits are known.

Affected products

• Open-Xchange GmbH Ox Dovecot Pro: up to and including 3.1.0; up to and including 2.4.0

Published 2025-10-31. Last modified 2026-10-07.