Is CVE-2026-66075 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-66075 being exploited in the wild.

How severe is CVE-2026-66075?

Informational severity, published 23 September 2026.

Which products and versions are affected?

RabbitMQ Before 3.13.15, 4.0.20, 4.1.11, 4.2.6, 4.3.1.

Is there a fix for CVE-2026-66075?

A patch was published on 2026-04-23: RabbitMQ 4.2.6 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-66075 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-66075?

Check whether you run 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-2026-66075: RabbitMQ privilege escalation in federation link restart

CVE-2026-66075 · Severity: info · Published 2026-09-23

RabbitMQ is a messaging broker that handles data routing and queueing. A monitoring user with read-only permissions can restart federation links—a state-changing operation that disrupts message flow between brokers. This allows privilege escalation from read-only access to impacting service availability without proper authorization checks.

Technologies: RabbitMQ. Vendors: RabbitMQ.

Quick answers

Is CVE-2026-66075 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-66075 being exploited in the wild.
How severe is CVE-2026-66075?: Informational severity, published 23 September 2026.
Which products and versions are affected?: RabbitMQ Before 3.13.15, 4.0.20, 4.1.11, 4.2.6, 4.3.1.
Is there a fix for CVE-2026-66075?: A patch was published on 2026-04-23: RabbitMQ 4.2.6 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-66075 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-66075?: Check whether you run 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 /federation-links/.../restart endpoint uses is_authorized_monitor for permission checks (allowing the monitoring tag) but allowed_methods permits DELETE, triggering delete_resource/2 without per-method privilege elevation validation. An attacker with monitoring credentials can invoke the restart operation to disrupt federation links. The vulnerability requires rabbitmq_federation and rabbitmq_federation_management plugins to be enabled.

Affected products

RabbitMQ RabbitMQ Before 3.13.15, 4.0.20, 4.1.11, 4.2.6, 4.3.1

Timeline

2026-09-23: disclosed
2026-04-23: patched: RabbitMQ 4.2.6 released
2026-05-20: patched: RabbitMQ 4.3.1 released

References

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