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.
History

Wed, 22 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 22 Apr 2026 05:30:00 +0000

Type Values Removed Values Added
First Time appeared Mailcow
Mailcow mailcow Dockerized
Vendors & Products Mailcow
Mailcow mailcow Dockerized

Wed, 22 Apr 2026 00:00:00 +0000

Type Values Removed Values Added
Description 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.
Title mailcow: dockerized vulnerable to stored XSS in autodiscover logs email address field
Weaknesses CWE-79
CWE-80
References
Metrics cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-22T13:37:20.223Z

Reserved: 2026-04-15T15:57:41.718Z

Link: CVE-2026-40872

cve-icon Vulnrichment

Updated: 2026-04-22T13:37:12.392Z

cve-icon NVD

Status : Received

Published: 2026-04-21T20:17:00.673

Modified: 2026-04-22T14:17:01.757

Link: CVE-2026-40872

cve-icon Redhat

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