{"id":"CVE-2026-67421","summary":"RabbitMQ: Stored HTML Injection in RabbitMQ Management OAuth Error Handling","details":"RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5, RabbitMQ Management rendered an AMQP authorization-error reason containing an attacker-controlled queue name as HTML when the OAuth management UI was enabled. Exploitation requires an attacker with queue configure permission, a management administrator who can see but cannot read that queue, and the administrator clicking Get Message(s). A queue name containing a base element can then retarget the automatic relative refresh because the Content Security Policy omits base-uri and connect-src, and an attacker endpoint that permits the management origin through CORS can receive the victim's Authorization header. This issue is fixed in versions 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5.","aliases":["GHSA-6256-27fm-4rgr"],"modified":"2026-09-27T03:47:33.461544448Z","published":"2026-09-25T16:39:02.323Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67421.json","unresolved_ranges":[{"extracted_events":[{"introduced":"3.13.0"},{"fixed":"3.13.19"},{"introduced":"4.0.0"},{"fixed":"4.0.24"},{"introduced":"4.1.0"},{"fixed":"4.1.15"},{"introduced":"4.2.0"},{"fixed":"4.2.10"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"WEB","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67421.json"},{"type":"ADVISORY","url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-6256-27fm-4rgr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67421"},{"type":"FIX","url":"https://github.com/rabbitmq/rabbitmq-server/commit/ff595eaaa6d4f580f72fa04801ffd35f48c46027"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rabbitmq/rabbitmq-server","events":[{"introduced":"1929eeadf9b2bac12c5434fb56884ef27370580e"},{"fixed":"ff595eaaa6d4f580f72fa04801ffd35f48c46027"},{"fixed":"0dde27bfdd1984ff7e157226fd97656854a7f359"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"4.3.0"},{"fixed":"4.3.5"}]}}],"versions":["v4.3.4","v4.3.3","v4.3.2","v4.3.1","v4.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67421.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:H/SI:L/SA:N"}]}