{"schema":"threatline.record/2","record":{"id":"CVE-2026-67421","aliases":["GHSA-6256-27fm-4rgr"],"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.","categories":["Unclassified"],"product":"rabbitmq-server","vendor":"rabbitmq","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-67421","source_modified_at":"2026-09-25T19:58:22.877Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"rabbitmq-server","vendor":"rabbitmq","versions":[{"version":">= 3.13.0, < 3.13.19","status":"affected"},{"version":">= 4.0.0, < 4.0.24","status":"affected"},{"version":">= 4.1.0, < 4.1.15","status":"affected"},{"version":">= 4.2.0, < 4.2.10","status":"affected"},{"version":">= 4.3.0, < 4.3.5","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":4.5,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.0028,"percentile":0.19429,"score_date":"2026-10-23"},"published_at":"2026-09-25T16:39:02.323Z","modified_at":"2026-09-25T19:58:22.877Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-67421","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-25T19:58:22.877Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-67421","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-6256-27fm-4rgr","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/rabbitmq/rabbitmq-server/commit/ff595eaaa6d4f580f72fa04801ffd35f48c46027","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-25T19:57:04.069632Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-25T19:58:22.877Z","content_hash":"b456038569da439f212c2b860919d40be46feb43afee7b0c1a1bfd5831c65d23"}}