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    CVE-2026-67412

    RabbitMQ is a messaging and streaming broker. From 3.13.0 until 4.3.3, 4.2.9 , 4.1.14, 4.0.24, and 3.13.18, Federation upstream in RabbitMQ skips vhost authorization allowing cross-vhost message access. what the bug lets you do. A policymaker on one vhost reads and drains messages out of another vhost it has no permission on. With the default ack-mode the source messages are consumed (deleted), not copied. Why that should not 1. Federation validates the upstream URI without any vhost-access Cross-vhost message read/drain from a per-vhost policymaker, breaking vhost tenancy This issue is fixed in versions 4.3.3, 4.2.9 , 4.1.14, 4.0.24, and 3.13.18.

    Published:Sep 25, 2026
    Last Modified:Oct 8, 2026
    EPS:Sep 25, 2026
    EPSS Score:0.00302
    CVSS Score:7.1

    Affected Products

    Vendor
    Broadcom
    Product
    Rabbitmq Server
    Vendor
    Rabbitmq
    Product
    Rabbitmq-server

    Exploits

    https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qjhttps://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qj

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High