Security Advisory

CVE-2026-40873

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-21 19:15:39

Last updated 2026-04-21 19:39:19

Assigner GitHub_M

State PUBLISHED

Description

mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the Quarantine details modal injects attachment filenames into HTML without escaping, allowing arbitrary HTML/JS execution. An attacker can deliver an email with a crafted attachment name so that when an admin views the quarantine item, JavaScript executes in their browser, taking over their account. Version 2026-03b fixes the vulnerability.

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