{"id":"CVE-2026-66078","summary":"RabbitMQ: protected tag bypass via bulk-delete","details":"RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15 and 4.0.20 and 4.1.11 and 4.2.6, protected tag bypass via bulk-delete. dELETE /api/users/:name refuses to delete users tagged protected (rabbitmgmtwmuser:deleteresource/2 checks isprotecteduser). POST /api/users/bulk-delete iterates the supplied username list and calls rabbitauthbackendinternal:deleteuser/2 directly , that function has no protected-tag check , so the guard is silently An administrator can delete protected-tagged service accounts via the bulk endpoint, bypassing a safeguard the test suite confirms is rabbitmqmanagement enabled Attacker has the administrator tag A protected-tagged user. This issue is fixed in versions 3.13.15 and 4.0.20 and 4.1.11 and 4.2.6.","aliases":["BIT-rabbitmq-2026-66078","GHSA-j9m2-hw6x-rqr9"],"modified":"2026-10-22T10:35:25.591755394Z","published":"2026-09-25T16:09:46.197Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66078.json","unresolved_ranges":[{"extracted_events":[{"range":[{"introduced":"3.13.0"},{"fixed":"3.13.15"},{"introduced":"4.0.0"},{"fixed":"4.0.20"},{"introduced":"4.1.0"},{"fixed":"4.1.11"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"}]}]},"references":[{"type":"WEB","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66078.json"},{"type":"ADVISORY","url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-j9m2-hw6x-rqr9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66078"},{"type":"FIX","url":"https://github.com/rabbitmq/rabbitmq-server/commit/e5b890a64b42ec1f79a8e9d735512150cf77479c"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rabbitmq/rabbitmq-server","events":[{"introduced":"95c501fbad76c66156346cf364d158d6e30aa4d9"},{"fixed":"8a56c37f099a7bf609a555de3f0ff8ed23964d20"},{"fixed":"e5b890a64b42ec1f79a8e9d735512150cf77479c"}],"database_specific":{"extracted_events":[{"source":"CPE_RANGE","cpe":"cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*","range":[{"introduced":"4.2.0"},{"fixed":"4.2.6"}]},{"range":[{"fixed":"e5b890a64b42ec1f79a8e9d735512150cf77479c"}],"source":"REFERENCES_COMMIT"},{"original_tag":"v4.2.6","range":[{"fixed":"8a56c37f099a7bf609a555de3f0ff8ed23964d20"}],"source":"REFERENCES_TAG"}]}}],"versions":["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/osv-test-cve-osv-conversion/osv-output/CVE-2026-66078.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}