VMware RabbitMQ up to 4.2.6/4.3.0 Stream Open privileges management

Summaryinfo

A vulnerability described as problematic has been identified in VMware RabbitMQ up to 4.2.6/4.3.0. The impacted element is an unknown function of the component Stream Open Handler. The manipulation results in privileges management. This vulnerability was named CVE-2026-66067. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in VMware RabbitMQ up to 4.2.6/4.3.0. It has been classified as problematic. Affected is an unknown code block of the component Stream Open Handler. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on integrity, and availability. CVE summarizes:

RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, The stream open handler calls only check_vhost_access; it omits the node/vhost/user connection-limit checks that rabbit_reader performs for AMQP. A developer %% FIXME comment at the cited line explicitly acknowledges the gap. No compensating enforcement exists in connection tracking or elsewhere in rabbitmq_stream. An authenticated tenant can fully bypass operator-configured per-user and per-vhost connection caps by connecting via port 5552 instead of 5672. Preconditions include rabbitmq_stream plugin enabled Authenticated stream-protocol credentials Operator relies on per-user/per-vhost connection limits for tenant isolation. This issue is fixed in versions 4.2.7 and 4.3.1.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-66067 since 07/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/23/2026). This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 4.2.7 or 4.3.1 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• VMware

Name

• RabbitMQ

Version

• 4.0
• 4.1
• 4.2
• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5
• 4.2.6
• 4.3.0

License

• commercial

Website

• Vendor: https://www.vmware.com/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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