RabbitMQ: AMQP 1.0 management exchange.declare skips alternate-exchange permission check

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-67241
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 17:17:12 UTC
Updated2026-09-29 20:17:22 UTC
DescriptionRabbitMQ is a messaging and streaming broker. From 4.2.0 until 4.2.9 and 4.3.3, AMQP 1.0 management exchange.declare skips alternate-exchange permission check. pUT /exchanges/:name (lines 192-240) checks only configure on the declared exchange and passes XArgs straight to rabbitexchange:declare/7. It omits the checkreadpermitted(X) + checkwritepermitted(AE) that rabbitchannel.erl:2540-2548 enforces for the alternate-exchange argument on the AMQP 0-9-1 path. The same file already implements the analogous DLX check for queues (lines 708-719), confirming this is a missing-check bug rather than intentional A user with only configure on exchange X can route X's unroutable messages into an alternate exchange they have no write permission AMQP 1.0 enabled (default in RabbitMQ 4.x) Attacker has configure on at least one exchange but lacks write on the target. This issue is fixed in versions 4.2.9 and 4.3.3.

Risk And Classification

Primary CVSS: v4.0 4.8 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.003470000 probability, percentile 0.257480000 (date 2026-09-29)

Problem Types: CWE-862 | CWE-862 CWE-862: Missing Authorization

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary4.8MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N/E:X/C...
4.0CNADECLARED4.8MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
High
User Interaction
None
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
Low
Sub Integrity
High
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rabbitmq Rabbitmq-server affected >= 4.2.0, < 4.2.9 Not specified
CNA Rabbitmq Rabbitmq-server affected >= 4.3.0, < 4.3.3 Not specified

References

ReferenceSourceLinkTags
github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 [email protected] github.com
github.com/rabbitmq/rabbitmq-server/commit/56005e7cebffc478ef397573de24a... [email protected] github.com
github.com/rabbitmq/rabbitmq-server/commit/18eac8d547b4382bf830c621b20a3... [email protected] github.com
github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3 [email protected] github.com
github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-rg2g-289m-xhhw 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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