All vulnerabilities
CVE-2026-67421GHSA-6256-27fm-4rgr

rabbitmq-server: RabbitMQ: Stored HTML Injection in RabbitMQ Management OAuth Error Handling

rabbitmq rabbitmq-server
CVSS
4.5Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 25 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.28%Chance of exploitation activity in the next 30 days, higher than 19% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published25 Sep 2026Updated 25 Sep 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

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.

Text from CVE List

Affected versions 5

  • rabbitmq-serveraffected: >= 3.13.0, < 3.13.19CVE List
  • rabbitmq-serveraffected: >= 4.0.0, < 4.0.24CVE List
  • rabbitmq-serveraffected: >= 4.1.0, < 4.1.15CVE List
  • rabbitmq-serveraffected: >= 4.2.0, < 4.2.10CVE List
  • rabbitmq-serveraffected: >= 4.3.0, < 4.3.5CVE List

References 3