CVE-2026-86009

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.

• CWE-285
• CWE-863

• https://github.com/Mailu/Mailu/commit/f05aeb8322e2f61096af6b089d61ba6f40587d96
• https://github.com/Mailu/Mailu/issues/2686
• https://github.com/Mailu/Mailu/pull/4072
• https://github.com/Mailu/Mailu/security/advisories/GHSA-crww-m82r-2wfm
• https://github.com/Mailu/Mailu/issues/2686

Published

Oct 16, 2026

Last Modified

Oct 21, 2026

Status

Deferred

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