CVE-2026-40872

Critical

Published: 21/04/2026(UTC)Translated: 05/08/2026(UTC)NVD NIST

Summary

In mailcow: dockerized before 2026-03b, Autodiscover logs in the admin dashboard render the EMailAddress value without HTML escaping. An unauthenticated attacker can submit a crafted Autodiscover request with HTML/JS, which executes when an admin views the logs.

Risk Assessment

Risk of malicious script execution in the admin session context, potentially leading to panel takeover.

Recommendation

Upgrade to version 2026-03b or later.

Original NVD description (English source)

mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the admin dashboard's Autodiscover logs render the EMailAddress value (logged as the "user" field) without HTML escaping. By submitting an unauthenticated Autodiscover request with a crafted EMailAddress containing HTML/JS, the payload is stored in Redis and executed when an admin views the Autodiscover logs. Version 2026-03b fixes the vulnerability.