# CVE-2026-67421: RabbitMQ Management XSS via queue name in OAuth UI

Source: https://junglewise.ai/threats/cve-2026-67421-rabbitmq-is-a-messaging-and-streaming-broker-from-3-13-0-until-3  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-25. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-67421 · Severity: info · Published 2026-09-25

RabbitMQ's web-based management console contains a cross-site scripting (XSS) vulnerability in the OAuth login flow that allows an attacker to steal an administrator's session credentials. An attacker with basic queue permissions can craft a malicious queue name containing HTML/JavaScript; when an administrator tries to view messages from that queue, the attacker's code executes in the admin's browser and exfiltrates their OAuth authorization token to an attacker-controlled server.

Technologies: [VMware RabbitMQ](https://junglewise.ai/threats/technologies/vmware-rabbitmq). Vendors: [VMware](https://junglewise.ai/threats/vendors/vmware).

## Quick answers

**Is CVE-2026-67421 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-67421 being exploited in the wild.

**How severe is CVE-2026-67421?** Informational severity, published 25 September 2026.

**Which products and versions are affected?** VMware RabbitMQ 3.13.0 through 3.13.18, 4.0.0 through 4.0.23, 4.1.0 through 4.1.14, 4.2.0 through 4.2.9, 4.3.0 through 4.3.4.

**Is there a fix for CVE-2026-67421?** A patch was published on 2026-09-25: Fixes available in RabbitMQ 3.13.19, 4.0.24, 4.1.15, 4.2.10, 4.3.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-67421 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-67421?** Check whether you run VMware RabbitMQ at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Management plugin's OAuth login template fails to properly escape queue names when rendering AMQP authorization errors as HTML. An attacker with queue configure permission crafts a queue name containing a base HTML element to retarget relative URL refreshes. Due to missing CSP directives (base-uri, connect-src) and permissive CORS on an attacker endpoint, the victim's Authorization header is leaked when the admin clicks "Get Message(s)" on the malicious queue.

## Affected products

- VMware RabbitMQ 3.13.0 through 3.13.18, 4.0.0 through 4.0.23, 4.1.0 through 4.1.14, 4.2.0 through 4.2.9, 4.3.0 through 4.3.4

## Timeline

- 2026-09-25: disclosed: CVE-2026-67421 published
- 2026-09-25: patched: Fixes available in RabbitMQ 3.13.19, 4.0.24, 4.1.15, 4.2.10, 4.3.5

## References

- [https://github.com/rabbitmq/rabbitmq-server/commit/ff595eaaa6d4f580f72fa04801ffd35f48c46027](https://github.com/rabbitmq/rabbitmq-server/commit/ff595eaaa6d4f580f72fa04801ffd35f48c46027)
- [https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.5)

## Related threats

- [RabbitMQ MQTT 5 parser invalid property denial of service](https://junglewise.ai/threats/cve-2026-67418-rabbitmq-is-a-messaging-and-streaming-broker-from-3-13-0-until-3)
- [RabbitMQ AMQP 1.0 parser descriptor validation bypass](https://junglewise.ai/threats/cve-2026-67416-rabbitmq-is-a-messaging-and-streaming-broker-from-4-0-0-until-4-0)
- [RabbitMQ AMQP 1.0 parser memory exhaustion](https://junglewise.ai/threats/cve-2026-67414-rabbitmq-is-a-messaging-and-streaming-broker-from-4-0-0-until-4-0)
- [RabbitMQ JMS topic exchange denial of service via regex wildcard expansion](https://junglewise.ai/threats/cve-2026-67413-rabbitmq-is-a-messaging-and-streaming-broker-from-4-0-0-until-4-0)
- [RabbitMQ Federation upstream authorization bypass](https://junglewise.ai/threats/cve-2026-67412-rabbitmq-is-a-messaging-and-streaming-broker-from-3-13-0-until-4)