Is CVE-2026-67407 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-67407 being exploited in the wild.

How severe is CVE-2026-67407?

Informational severity, published 25 September 2026.

Which products and versions are affected?

VMware RabbitMQ 4.0.0 to 4.0.22, 4.1.0 to 4.1.13, 4.2.0 to 4.2.8, 4.3.0 to 4.3.2.

Is there a fix for CVE-2026-67407?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-67407 attacked?

It is attacked over the network.

Am I affected by CVE-2026-67407?

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.

CVE-2026-67407: RabbitMQ MQTT topic permission bypass in regex escaping

CVE-2026-67407 · Severity: info · Published 2026-09-25

RabbitMQ is a messaging broker that handles MQTT communications. An incomplete security fix allows low-privileged authenticated MQTT users to bypass topic permission restrictions by crafting a clientid that breaks out of character class patterns in permission templates. This could allow unauthorized read and write access to message topics that should be restricted.

Technologies: VMware RabbitMQ. Vendors: VMware.

Quick answers

Is CVE-2026-67407 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-67407 being exploited in the wild.
How severe is CVE-2026-67407?: Informational severity, published 25 September 2026.
Which products and versions are affected?: VMware RabbitMQ 4.0.0 to 4.0.22, 4.1.0 to 4.1.13, 4.2.0 to 4.2.8, 4.3.0 to 4.3.2.
Is there a fix for CVE-2026-67407?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-67407 attacked?: It is attacked over the network.
Am I affected by CVE-2026-67407?: 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 escaperegexchar/1 function fails to escape the hyphen (-) character when constructing regex patterns for MQTT topic permissions, despite fixing other metacharacters for CVE-2026-44838. An authenticated attacker controlling their clientid can inject regex syntax when templates embed {clientid} inside a [...] character class, bypassing intended permission boundaries. Patches are available in versions 4.3.3, 4.2.9, 4.1.14, and 4.0.23.

Affected products

VMware RabbitMQ 4.0.0 to 4.0.22, 4.1.0 to 4.1.13, 4.2.0 to 4.2.8, 4.3.0 to 4.3.2

Timeline

2026-09-25: disclosed

References

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