{"id":"CVE-2026-67412","summary":"RabbitMQ: Federation upstream skips vhost authorization allowing cross-vhost message access","details":"RabbitMQ is a messaging and streaming broker. From 3.13.0 until 4.3.3, 4.2.9 , 4.1.14, 4.0.24, and 3.13.18, Federation upstream in RabbitMQ skips vhost authorization allowing cross-vhost message access. what the bug lets you do. A policymaker on one vhost reads and drains messages out of another vhost it has no permission on. With the default ack-mode the source messages are consumed (deleted), not copied. Why that should not 1. Federation validates the upstream URI without any vhost-access Cross-vhost message read/drain from a per-vhost policymaker, breaking vhost tenancy This issue is fixed in versions 4.3.3, 4.2.9 , 4.1.14, 4.0.24, and 3.13.18.","aliases":["GHSA-42pc-678q-v8qj"],"modified":"2026-09-27T03:47:29.303739732Z","published":"2026-09-25T16:20:13.605Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67412.json","unresolved_ranges":[{"extracted_events":[{"introduced":"4.1.0"},{"fixed":"4.1.14"},{"introduced":"4.0.0"},{"fixed":"4.0.24"},{"introduced":"3.13.0"},{"fixed":"3.13.18"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"WEB","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9"},{"type":"WEB","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67412.json"},{"type":"ADVISORY","url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67412"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rabbitmq/rabbitmq-server","events":[{"introduced":"1929eeadf9b2bac12c5434fb56884ef27370580e"},{"introduced":"95c501fbad76c66156346cf364d158d6e30aa4d9"},{"fixed":"1d284b2d2a1e2f845ad22b0d5ee38ec372d50802"},{"fixed":"47d6d6457c7d1a440daed643cb7d76bba313e79c"}],"database_specific":{"extracted_events":[{"introduced":"4.3.0"},{"fixed":"4.3.3"},{"introduced":"4.2.0"},{"fixed":"4.2.9"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v4.2.8","v4.3.2","v4.2.7","v4.3.1","v4.2.6","v4.3.0","v4.2.5","v4.2.4","v4.2.3","v4.2.2","v4.2.1","v4.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67412.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N"}]}