CVE-2026-66071: rabbitmq server from 3.13.0 (inclusive), before 3.13.15 (exclusive), from 4.0.0 (inclusive), before 4.0.22…

Affected technology

rabbitmq server · from 3.13.0 (inclusive), before 3.13.15 (exclusive)
broadcom

rabbitmq server · from 4.0.0 (inclusive), before 4.0.22 (exclusive)
broadcom

rabbitmq server · from 4.1.0 (inclusive), before 4.1.11 (exclusive)
broadcom

rabbitmq server · from 4.2.0 (inclusive), before 4.2.6 (exclusive)
broadcom

rabbitmq server · from 4.3.0 (inclusive), before 4.3.1 (exclusive)
broadcom

rabbitmq-server · >= 3.13.0, < 3.13.15, >= 4.0.0, < 4.0.22, >= 4.1.0, < 4.1.11, >= 4.2.0, < 4.2.6, >= 4.3.0, < 4.3.1
rabbitmq

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

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. Vendor/CNA’s CVSS 4.0 assessment (base score 6.0/10) rates confidentiality and integrity impact as none; availability impact as high.