VYPR
Published Jul 18, 2026· Updated Jul 19, 2026· 1 source

RabbitMQ: Nine Vulnerabilities Disclosed Together, Threatening Authentication and Data Integrity

Key findings • Nine RabbitMQ vulnerabilities disclosed on July 18, 2026, impact authentication, authorization, and management functionalities. • Key risks include OAuth secret leakage (CVE-20…

Key findings

  • Nine RabbitMQ vulnerabilities disclosed on July 18, 2026, impact authentication, authorization, and management functionalities.
  • Key risks include OAuth secret leakage (CVE-2026-57219) and cross-tenant data exposure (CVE-2026-57221).
  • Cross-site scripting (CVE-2026-57214) and authentication bypass (CVE-2026-57216) are among the disclosed flaws.
  • Affected versions vary, with patches available in releases up to 4.2.6 for many issues.
  • Users should update RabbitMQ to the latest patched versions to address these vulnerabilities.

On July 18, 2026, a batch of nine vulnerabilities was disclosed for the RabbitMQ message broker, impacting various versions and affecting core functionalities such as authentication, authorization, and management. These vulnerabilities, detailed in CVEs CVE-2026-57211, CVE-2026-57218, CVE-2026-57216, CVE-2026-57214, CVE-2026-57219, CVE-2026-57221, CVE-2026-57220, CVE-2026-57217, and CVE-2026-57215, highlight potential risks including unauthorized access, information disclosure, and denial-of-service conditions.

Several vulnerabilities center on authorization bypass and information leakage. CVE-2026-57219 and CVE-2026-57221, noted in related security reporting, specifically address the potential for attackers to leak OAuth client secrets and expose cross-tenant queue metadata. CVE-2026-57219, affecting versions prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, involves an obsolete GET /api/auth endpoint that can disclose the OAuth 2 client secret to unauthenticated callers when the management plugin and OAuth are configured. CVE-2026-57221, also impacting similar versions, allows any authenticated user to enumerate queue and exchange names and read their metadata due to a lack of authorization checks on passive queue.declare and exchange.declare AMQP 0-9-1 operations.

Other disclosed issues include a cross-site scripting (XSS) vulnerability in the management UI (CVE-2026-57214), where queue or exchange arguments are not properly escaped, allowing JavaScript execution. CVE-2026-57218 points to a flaw where existing consumers can continue receiving messages after OAuth token expiry or connection secret refresh, as consumers are not reauthorized at delivery time. CVE-2026-57216 addresses an authentication bypass that could allow a loopback-restricted user to connect remotely under specific trusted PROXY-protocol conditions. Furthermore, CVE-2026-57220 describes a vulnerability in the stream listener that fails to enforce frame-size limits during authentication, potentially allowing oversized frames. CVE-2026-57217 highlights a topic authorization issue where metadata-store failures can lead to unintended topic writes and binds. Finally, CVE-2026-57211 involves a static file handler that may pass URL-encoded backslashes to a file loading function before path validation, potentially leading to unintended file access when multiple management extension plugins are enabled. CVE-2026-57215 concerns foreign bindings to amq.rabbitmq.reply-to destinations due to missing deletion checks for volatile direct-reply-to queues.

The affected versions vary across the disclosed vulnerabilities. For instance, CVE-2026-57219 and CVE-2026-57215 are patched in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6. CVE-2026-57214 is fixed in versions prior to 4.2.5. CVE-2026-57218 and CVE-2026-57220 are addressed in versions prior to 4.2.6. CVE-2026-57216 and CVE-2026-57217 are resolved in versions prior to 3.13.15, 4.0.21, 4.1.11, and 4.2.6. CVE-2026-57211 is patched in versions prior to 4.1.11 and 4.2.6 on Windows. Users are advised to update to the patched versions to mitigate these security risks.

This coordinated disclosure of multiple vulnerabilities underscores the importance of maintaining up-to-date RabbitMQ installations. The range of issues, from authentication bypass to XSS and sensitive data leakage, presents a significant attack surface if left unaddressed. Users should prioritize applying the relevant patches based on their RabbitMQ version and configuration to secure their messaging infrastructure. The disclosures, particularly those concerning OAuth secrets and cross-tenant data exposure, highlight critical areas for security review in multi-tenant or OAuth-integrated RabbitMQ deployments.

Synthesized by Vypr AI