{"id":"CVE-2026-86009","summary":"Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control","details":"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.","aliases":["GHSA-crww-m82r-2wfm"],"modified":"2026-10-17T02:48:33.149237189Z","published":"2026-10-16T16:19:06.420Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-285","CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86009.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86009.json"},{"type":"FIX","url":"https://github.com/Mailu/Mailu/commit/f05aeb8322e2f61096af6b089d61ba6f40587d96"},{"type":"REPORT","url":"https://github.com/Mailu/Mailu/issues/2686"},{"type":"FIX","url":"https://github.com/Mailu/Mailu/pull/4072"},{"type":"ADVISORY","url":"https://github.com/Mailu/Mailu/security/advisories/GHSA-crww-m82r-2wfm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86009"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mailu/mailu","events":[{"introduced":"0"},{"fixed":"f05aeb8322e2f61096af6b089d61ba6f40587d96"}]}],"versions":["2024.06.1","2024.06.0","2.0.0","1.9.10","1.9.9","1.9.8","1.9.7","1.9.6","1.9.5","1.9.4","1.9.3","1.9.2","1.9.1","1.9.0","1.8-rc"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86009.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}