{"id":"CVE-2026-86009","state":"PUBLISHED","title":"Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control","description":"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.","publishedAt":"2026-10-16T16:19:06.420Z","updatedAt":"2026-10-21T02:26:54.464Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["Mailu Mailu"],"affected":[{"vendor":"Mailu","product":"Mailu","versions":[{"version":"< f05aeb8322e2f61096af6b089d61ba6f40587d96","status":"affected"}]}],"references":["https://github.com/Mailu/Mailu/security/advisories/GHSA-crww-m82r-2wfm","https://github.com/Mailu/Mailu/issues/2686","https://github.com/Mailu/Mailu/pull/4072","https://github.com/Mailu/Mailu/commit/f05aeb8322e2f61096af6b089d61ba6f40587d96"],"weaknesses":["CWE-285","CWE-863"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/86xxx/CVE-2026-86009.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-86009","state":"PUBLISHED","datePublished":"2026-10-16T16:19:06.420Z","dateUpdated":"2026-10-21T02:26:54.464Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-09-04T19:17:36.246Z"},"containers":{"cna":{"title":"Mailu: Domain managers can allow themselves to spoof on other hosted domains they should not control","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Mailu","product":"Mailu","versions":[{"version":"< f05aeb8322e2f61096af6b089d61ba6f40587d96","status":"affected"}]}],"references":[{"url":"https://github.com/Mailu/Mailu/security/advisories/GHSA-crww-m82r-2wfm","name":"https://github.com/Mailu/Mailu/security/advisories/GHSA-crww-m82r-2wfm","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/Mailu/Mailu/issues/2686","name":"https://github.com/Mailu/Mailu/issues/2686","tags":["x_refsource_MISC"]},{"url":"https://github.com/Mailu/Mailu/pull/4072","name":"https://github.com/Mailu/Mailu/pull/4072","tags":["x_refsource_MISC"]},{"url":"https://github.com/Mailu/Mailu/commit/f05aeb8322e2f61096af6b089d61ba6f40587d96","name":"https://github.com/Mailu/Mailu/commit/f05aeb8322e2f61096af6b089d61ba6f40587d96","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-285","lang":"en","description":"CWE-285: Improper Authorization","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-16T16:19:06.420Z"},"source":{"advisory":"GHSA-crww-m82r-2wfm","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/Mailu/Mailu/issues/2686","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-21T02:26:25.611618Z","id":"CVE-2026-86009","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-21T02:26:54.464Z"}}]}}}