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CVE-2026-40874

mailcow: dockerized missing authorization on Forwarding Hosts delete action

MEDIUM
6
CVSS Score
Published: April 21, 2026 at 07:17 PM UTC
Updated: October 26, 2026 at 09:10 PM UTC
1 product affected across 1 vendorMailcow

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Severity
MEDIUM6
Exploit prediction
EPSS 0.2%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mailcow· Mailcow
90%
v < 2026-03b
Affected range stops below 2026-3b, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRM
Source: cverecord
https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-jjxh-rm7p-hjc3

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-284

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