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CVE-2026-67412

RabbitMQ: Federation upstream skips vhost authorization allowing cross-vhost message access

HIGH
7.1
CVSS Score
Published: September 25, 2026 at 04:20 PM UTC
Updated: October 8, 2026 at 04:44 PM UTC
2 products affected across 2 vendorsRabbitmq ServerRabbitmq Server

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Severity
HIGH7.1
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rabbitmq Server· Broadcom
95%
3.13.0 ≤ v < 3.13.184.0.0 ≤ v < 4.0.244.1.0 ≤ v < 4.1.144.2.0 ≤ v < 4.2.94.3.0 ≤ v < 4.3.3*
Affected range stops below 3.13.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.0.24, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.1.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.3, so it looks safe — our inference, not a vendor statement
Rabbitmq Server· Rabbitmq
90%
>= 3.13.0, < 3.13.18>= 4.0.0, < 4.0.24>= 4.1.0, < 4.1.14>= 4.2.0, < 4.2.9>= 4.3.0, < 4.3.3
Affected range stops below 3.13.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.0.24, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.1.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.3.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMExploitVendor Advisory
Source: cverecord
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-42pc-678q-v8qj
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-862

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