CVE-2026-40874 MEDIUM

CVE-2026-40874: mailcow: dockerized missing authorization on Forwarding Hosts delete action

Vendor Mailcow
Product mailcow-dockerized
Weakness CWE-284
Published April 21, 2026
Last update April 21, 2026
View on NVD All CVEs

CVSS base score

6.0/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, no administrator verification takes place when deleting Forwarding Hosts with `/api/v1/delete/fwdhost`. Any authenticated user can call this API. Checks are only applied for edit/add actions, but deletion can still significantly disrupt the mail service. Version 2026-03b fixes the vulnerability.

Key dates

02Disclosure timeline

April 21, 2026 CVE published
April 21, 2026 Record updated