{"id":"BIT-rabbitmq-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":["CVE-2026-67412","GHSA-42pc-678q-v8qj"],"modified":"2026-10-09T12:00:14.273016271Z","published":"2026-10-01T09:33:53.667Z","database_specific":{"cpes":["cpe:2.3:a:vmware:rabbitmq:*:*:*:*:*:*:*:*"],"severity":"High"},"references":[{"type":"ARTICLE","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9"},{"type":"ARTICLE","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3"},{"type":"ADVISORY","url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qj"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67412"}],"affected":[{"package":{"name":"rabbitmq","ecosystem":"Bitnami","purl":"pkg:bitnami/rabbitmq"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.13.0"},{"fixed":"3.13.18"},{"introduced":"4.0.0"},{"fixed":"4.0.24"},{"introduced":"4.1.0"},{"fixed":"4.1.14"},{"introduced":"4.2.0"},{"fixed":"4.2.9"},{"introduced":"4.3.0"},{"fixed":"4.3.3"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/rabbitmq/BIT-rabbitmq-2026-67412.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"}]}],"schema_version":"1.9.0"}