CVE-2026-86009

UNKNOWN 0.0

Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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	CWE-285 CWE-863
Vendor	mailu
Product	mailu
Published	Oct 16, 2026

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Affected Versions

Mailu / Mailu

< f05aeb8322e2f61096af6b089d61ba6f40587d96

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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