CVE-2025-25198: Mailcow Mailcow: Dockerized

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

mailcow: dockerized is an open source groupware/email suite based on docker. Prior to version 2025-01a, a vulnerability in mailcow's password reset functionality allows an attacker to manipulate the `Host HTTP` header to generate a password reset link pointing to an attacker-controlled domain. This can lead to account takeover if a user clicks the poisoned link. Version 2025-01a contains a patch. As a workaround, deactivate the password reset functionality by clearing `Notification email sender` and `Notification email subject` under System -> Configuration -> Options -> Password Settings.

Affected products

• Mailcow Mailcow: Dockerized: before 2025-01a (fixed in 2025-01a)

Published 2025-02-12. Last modified 2026-06-17.