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CVE-2026-66071

6.5 · MEDIUM

RabbitMQ is a messaging and streaming broker.

Published Sep 25, 2026broadcomCWE-400EPSS 0.54%

Overview

CVE-2026-66071 is a medium-severity vulnerability affecting broadcom rabbitmq_server. It was published on September 25, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15 and 4.0.22 and 4.1.11 and 4.2.6 and 4.3.1, Atom exhaustion: OAuth2 JWT tag: scope values. extractscopes/1 parses scopes of the form .tag: and calls rabbitdatacoercion:toatom() to convert to a tag atom. The token signature is verified first, so the attacker cannot forge scopes , but in IdP configurations where scope content is user-influenced, each login with a novel tag value leaks one In deployments where users can influence the scopes included in their IdP-issued JWT rabbitmqauthbackendoauth2 enabled IdP permits attacker-influenced scope values in signed tokens. This issue is fixed in versions 3.13.15 and 4.0.22 and 4.1.11 and 4.2.6 and 4.3.1.

Remediation

Check the references section for vendor advisories and patches from broadcom. Update rabbitmq_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
broadcomrabbitmq_server>= 3.13.0, < 3.13.15Affected

References

GitHubgithub.com/rabbitmq/rabbitmq-server/commit/9a44124d9c932d6fc7d2a3b945e5a143e547bcb6GitHubgithub.com/rabbitmq/rabbitmq-server/commit/c5690583a53789a3bf00cca508b43e8246db0d11GitHubgithub.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6GitHubgithub.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1GitHubgithub.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-89p2-f5cv-x5cg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-66071?

CVE-2026-66071 is a medium-severity vulnerability affecting broadcom rabbitmq_server. It was published on September 25, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-66071?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-66071?

Check the references section for vendor advisories and patches from broadcom. Update rabbitmq_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-66071?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-66071 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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