CVE-2026-86009 — Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control
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 n…
Published: 2026-10-16 · CVSS: 8.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7