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.
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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-16T16:19:06.420Z

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.