CVE-2026-67241 rabbitmq CVE debrief

Who should care

RabbitMQ administrators and users with configure permissions on exchanges should assess exposure and verify user permissions. This includes operators, platform teams, vulnerability management teams, and security teams who manage RabbitMQ deployments, especially where AMQP 1.0 is enabled. Verification of user permissions and exchange configurations is necessary to determine exposure and prioritize remediation.

Why it matters

Defenders should care about CVE-2026-67241 because it allows users with configure permissions on RabbitMQ exchanges to route messages into alternate exchanges they lack write permissions for, potentially leading to unauthorized message routing. RabbitMQ administrators and users with configure permissions on exchanges should assess exposure, especially in deployments with AMQP 1.0 enabled. Verification of user permissions and exchange configurations is necessary to determine exposure and prioritize remediation.

• Potential unauthorized message routing due to missing permission checks
• Exposure of RabbitMQ deployments with AMQP 1.0 enabled and custom exchange configurations
• Verification priority for user permissions and exchange configurations

Technical summary

The vulnerability occurs in the exchange.declare method of RabbitMQ's AMQP 1.0 management plugin. It skips the alternate-exchange permission check, allowing users with configure permissions on an exchange to route unroutable messages into an alternate exchange they lack write permissions for. This issue can lead to unauthorized message routing. The vulnerability is fixed in versions 4.2.9 and 4.3.3. Affected deployments should be verified for exposure, and user permissions should be assessed to prioritize remediation.

Defensive priority

Defenders should prioritize verifying exposure in RabbitMQ deployments, especially where AMQP 1.0 is enabled, and assess user permissions for exchanges.

Recommended defensive actions

• Verify RabbitMQ version and AMQP 1.0 configuration
• Assess user permissions for exchanges
• Update to version 4.2.9 or 4.3.3 if vulnerable
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source references provide details on the vulnerability, affected versions, and fixed versions (4.2.9 and 4.3.3). The issue is caused by a missing permission check in the exchange.declare method of RabbitMQ's AMQP 1.0 management plugin. The vulnerability allows users with configure permissions on an exchange to route unroutable messages into an alternate exchange they lack write permissions for. Evidence limits are based on source-provided information and CVE details. Defenders should verify exposure in RabbitMQ 4.2.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.