{"id":"CVE-2026-67421","title":"RabbitMQ is a messaging and streaming broker","summary":"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 OAu…","severity":"medium","cvss":6.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-862","CWE-79"],"vendor":"broadcom","product":"rabbitmq_server","affected":["rabbitmq_server >= 3.13.0, < 3.13.9","rabbitmq_server >= 4.0.0, < 4.0.24","rabbitmq_server >= 4.1.0, < 4.1.15","rabbitmq_server >= 4.2.0, < 4.2.10","rabbitmq_server >= 4.3.0, < 4.3.5"],"patched":["rabbitmq_server 4.3.5"],"published":"2026-09-25","updated":"2026-10-06","sourceUpdated":"2026-10-06T19:53:05.337","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67421","references":[{"url":"https://github.com/rabbitmq/rabbitmq-server/commit/ff595eaaa6d4f580f72fa04801ffd35f48c46027","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-6256-27fm-4rgr","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-6256-27fm-4rgr","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67421.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-67421"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541533"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67421"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67421"},{"url":"https://access.redhat.com/errata/RHSA-2026:67552"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat","score-dispute"],"epss":0.0028,"epssPercentile":0.20362,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-25T19:57:04.069632Z"},"scores":{"nvd":6.8,"cna":4.5,"vendor":4.4},"ingestedAt":"2026-09-25T17:13:14.019Z","slug":"CVE-2026-67421","body":"## Overview\n\nRabbitMQ 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.\n\n## Affected\n\n- `rabbitmq_server >= 3.13.0, < 3.13.9`\n- `rabbitmq_server >= 4.0.0, < 4.0.24`\n- `rabbitmq_server >= 4.1.0, < 4.1.15`\n- `rabbitmq_server >= 4.2.0, < 4.2.10`\n- `rabbitmq_server >= 4.3.0, < 4.3.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `rabbitmq_server 4.3.5`\n\n## Vendor advisories\n\n- **RHSA-2026:67552** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67552)\n- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0 · no fix planned: Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat Hardened Images, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67421.json)","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":37.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":216713,"id":"CVE-2026-67421","ts":1791317840253,"field":"cvss","old":"4.5","new":"6.8"},{"seq":211163,"id":"CVE-2026-67421","ts":1790367519825,"field":"exploit_available","old":"false","new":"true"}]}