Mailu is a mail server distributed as a set of Docker images. Prior to f05aeb8322e2f61096af6b089d61ba6f40587d96, domain managers can enable spoofing for hosted domains they do not control. A potentially malicious domain administrator enables spoofing for another hosted domain and can send emails that are authenticated with DKIM/SPF for domains they should not be able to. This vulnerability is addressed by f05aeb8322e2f61096af6b089d61ba6f40587d96.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 21 Oct 2026 03:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 18 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
First Time appeared Mailu
Mailu mailu
Vendors & Products Mailu
Mailu mailu

Fri, 16 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Description Mailu is a mail server distributed as a set of Docker images. Prior to f05aeb8322e2f61096af6b089d61ba6f40587d96, domain managers can enable spoofing for hosted domains they do not control. A potentially malicious domain administrator enables spoofing for another hosted domain and can send emails that are authenticated with DKIM/SPF for domains they should not be able to. This vulnerability is addressed by f05aeb8322e2f61096af6b089d61ba6f40587d96.
Title Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control
Weaknesses CWE-285
CWE-863
References
Metrics cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-21T02:26:54.464Z

Reserved: 2026-09-04T19:17:36.246Z

Link: CVE-2026-86009

cve-icon Vulnrichment

Updated: 2026-10-21T02:26:44.745Z

cve-icon NVD

Status : Deferred

Published: 2026-10-16T17:17:51.920

Modified: 2026-10-21T03:17:19.877

Link: CVE-2026-86009

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-18T14:15:14Z

Weaknesses