Medium 4.5Published Sep 25, 2026

CVE-2026-67421RabbitMQ: Stored HTML Injection in RabbitMQ Management OAuth Error Handling

Updated under an hour ago (Oct 28, 2026, 3:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 4.5 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Sep 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

rabbitmq rabbitmq-server rabbitmq:server (from the name)	from 3.13.0, < 3.13.19; from 4.0.0, < 4.0.24; from 4.1.0, < 4.1.15; from 4.2.0, < 4.2.10; from 4.3.0, < 4.3.5	CNA record
broadcom rabbitmq_server broadcom:rabbitmq_server	from 3.13.0 before 3.13.9; from 4.0.0 before 4.0.24; from 4.1.0 before 4.1.15; from 4.2.0 before 4.2.10; from 4.3.0 before 4.3.5	NVD

References

References

https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-6256-27fm-4rgr	x-refsource-confirm, exploit, vendor-advisory
https://github.com/rabbitmq/rabbitmq-server/commit/ff595eaaa6d4f580f72fa04801ffd35f48c46027	x-refsource-misc, patch
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.