CVE-2026-67236 rabbitmq CVE debrief

Who should care

Defenders responsible for RabbitMQ deployments, particularly those using versions 4.2.0 to 4.2.8 and 4.3.2, should assess exposure and implement compensating controls. This includes verifying RabbitMQ versions and configurations, reviewing compensating controls for exposed systems, and monitoring for potential credential recovery attempts. Additionally, defenders should prioritize verifying exposure and implementing compensating controls due to the high-se

Why it matters

CVE-2026-67236 is a high-severity vulnerability in RabbitMQ that allows for the recovery of login credentials due to insecure cookie handling, requiring verification and remediation priority for affected deployments.

• Potential credential recovery by attackers with same-origin cross-site scripting, HTTP-readable network position, or local access to the browser cookie store
• Verification priority for RabbitMQ deployments to ensure secure cookie handling
• Remediation priority to update to fixed versions 4.2.8 or 4.3.2

Technical summary

RabbitMQ versions 4.2.0 to 4.2.8 and 4.3.2 have a vulnerability where a successful POST /login request sets an auth cookie containing base64-encoded username:password credentials without HttpOnly, Secure, SameSite, or expiration protections. This allows an attacker to recover the actual login credentials using same-origin cross-site scripting, an HTTP-readable network position, or local access to the browser cookie store. The vulnerability is fixed in versions 4.2.8 and 4.3.2, and defenders should prioritize verifying exposure and implementing compensating controls.

Defensive priority

Defenders should prioritize verifying exposure and implementing compensating controls due to the potential for credential recovery.

Recommended defensive actions

• Verify exposure by checking RabbitMQ versions and configurations
• Implement compensating controls such as HTTP-only and secure cookie flags
• Monitor for potential credential recovery attempts
• Update to fixed versions 4.2.8 or 4.3.2
• Review 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 NVD entry provide details on the vulnerability, but evidence is limited regarding actual exploitation and affected scope. Defenders should verify RabbitMQ versions and configurations to ensure secure cookie handling, and review compensating controls for exposed systems while remediation is scheduled and verified. The vulnerability has a CVSS score of 8.2 and is considered high-severity.

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.