{"schema":"threatline.record/2","record":{"id":"CVE-2026-86009","aliases":["GHSA-crww-m82r-2wfm"],"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.","categories":["Unclassified"],"product":"Mailu","vendor":"Mailu","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-86009","source_modified_at":"2026-10-21T02:26:54.464Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Mailu","vendor":"Mailu","versions":[{"version":"< f05aeb8322e2f61096af6b089d61ba6f40587d96","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":8.2,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00297,"percentile":0.21284,"score_date":"2026-10-23"},"published_at":"2026-10-16T16:19:06.420Z","modified_at":"2026-10-21T02:26:54.464Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-86009","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T02:26:54.464Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-86009","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/Mailu/Mailu/security/advisories/GHSA-crww-m82r-2wfm","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/Mailu/Mailu/issues/2686","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/Mailu/Mailu/pull/4072","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/Mailu/Mailu/commit/f05aeb8322e2f61096af6b089d61ba6f40587d96","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-21T02:26:25.611618Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-21T02:26:54.464Z","content_hash":"b17e3f0dac8c38e73375bf2a60e2b04f9a5b45c0c3a9dbb5b86cc00b72668132"}}