Miggo researchers discovered two vulnerabilities that could allow attackers to seize control of vulnerable message brokers or expose data across shared environments.
While there is no evidence either vulnerability has been exploited in the wild, organizations running affected RabbitMQ versions should prioritize applying the available patches.
Key Takeaways of the RabbitMQ Vulnerabilities
- Two RabbitMQ vulnerabilities could enable unauthenticated broker takeover or expose tenant metadata in affected deployments.
- CVE-2026-57219 allows attackers to obtain a RabbitMQ OAuth client secret and potentially gain administrative control of vulnerable brokers.
- CVE-2026-57221 bypasses authorization checks, allowing authenticated users to enumerate queues, exchanges, and tenant metadata.
Inside the RabbitMQ Vulnerabilities
RabbitMQ is one of the world’s most widely deployed open-source message brokers, serving as the messaging backbone for many enterprise applications.
It enables communication between distributed services, processes payment transactions, handles authentication events, and supports cloud-native applications and microservices.
Because RabbitMQ often sits at the center of business-critical infrastructure, vulnerabilities affecting the platform can expose sensitive application data and disrupt essential business operations.
Miggo researchers identified two access-control vulnerabilities affecting RabbitMQ.
One allows an unauthenticated attacker to obtain the broker’s confidential OAuth client secret, while the other enables any authenticated user to view metadata belonging to other tenants despite having no permissions.
Both vulnerabilities were introduced in RabbitMQ 3.13.0 in early 2024 and remained in the codebase until they were discovered by Miggo and responsibly disclosed to the RabbitMQ maintainers.
While there is no evidence either flaw has been exploited in the wild, the company recommends organizations prioritize remediation because of the potential impact on enterprise environments.
CVE-2026-57219: Unauthenticated OAuth Secret Leak Could Enable Full Broker Takeover
CVE-2026-57219, with a CVSS score of 8.7, stems from an authorization flaw in RabbitMQ’s obsolete /api/auth management endpoint.
The endpoint returned the broker’s confidential OAuth client secret without requiring authentication, allowing anyone who could reach the management interface to retrieve the credential with a single request.
The risk is greatest for organizations using RabbitMQ as a confidential OAuth client with identity providers such as Microsoft Entra ID, Auth0, Keycloak, or Cloud Foundry UAA.
An attacker who obtains the exposed client secret could exchange it with the identity provider for an administrator access token, effectively impersonating the broker.
Successful exploitation could provide administrative control over RabbitMQ, including its users, queues, exchanges, messages, and broker configuration.
Miggo attributed the issue to an authorization check that always approved requests instead of restricting access to sensitive management data.
CVE-2026-57221: Authorization Bypass Exposes Tenant Metadata
The second vulnerability, CVE-2026-57221, has a CVSS of 5.3 and affects RabbitMQ’s passive queue and exchange declaration functionality.
This feature allows clients to verify whether a queue or exchange exists without modifying it, but Miggo discovered that the operation failed to perform the authorization checks enforced by comparable RabbitMQ functions.
As a result, any authenticated user — including an account with no assigned permissions — could enumerate queues and exchanges and retrieve metadata such as message counts and consumer statistics.
Although the flaw does not expose message contents or allow unauthorized modification of data, it weakens tenant isolation by revealing operational details about other applications or users sharing the same RabbitMQ environment.
In multi-tenant deployments, that information could help attackers map application architectures, identify high-value targets, and gather reconnaissance for follow-on attacks.
Reducing RabbitMQ Risk
Organizations using affected RabbitMQ versions should apply the available patches and review their configurations to reduce potential risk.
- Patch to the latest version and rotate OAuth client secrets after patching if your deployment uses confidential OAuth clients.
- If immediate patching is not possible, consider compensating controls such as a WAF rule to block access to the vulnerable endpoint for CVE-2026-57219.
- Restrict access to the RabbitMQ management interface using network segmentation, VPNs, IP allowlists, or Zero Trust access controls, and never expose it to untrusted networks.
- Review RabbitMQ users, administrator accounts, virtual hosts, and permissions to enforce least privilege and isolate tenants in dedicated virtual hosts where appropriate.
- Monitor management interface logs and broker activity for unauthorized API requests, unexpected administrator access, configuration changes, or unusual queue enumeration attempts.
- Test incident response plans with tabletops and simulation tools, with scenarios around broker compromises or unauthorized access to messaging infrastructure.
These measures can help reduce overall risk, limit the blast radius of compromise, and build resilience.
Bottom Line
Although neither vulnerability has been observed in active attacks at the time of publication, organizations should review their RabbitMQ deployments to identify affected versions and configurations.
They should also confirm that management interfaces are properly secured and that embedded or packaged RabbitMQ instances are included in routine vulnerability management processes.
These reviews can help identify overlooked infrastructure that may otherwise remain vulnerable after upstream patches are released.
As organizations strengthen the security of platforms such as RabbitMQ, many are also adopting Zero Trust solutions to help protect critical applications and infrastructure.