CVE-2026-5721 Allows Exposure of OAuth Client Secrets
RabbitMQ, a widely used open source message broker that enables asynchronous communication by routing, buffering, and distributing messages between applications, is affected by the issue. The CVE-2026-5721 flaw carries a CVSS severity score of 8.7 and stems from an exposed management endpoint that returns the OAuth client secret without requiring authentication.
The RabbitMQ configure the broker with a confidential password for identity provider authentication.
The that the highest risk exists when the management interface is accessible from untrusted networks. The risk is sharpest wherever the management port is reachable by an untrusted network: cloud or multi-tenant setups, or a management UI accidentally exposed to the score of 5.3. This authorization issue allows any authenticated user to enumerate queues and exchanges while viewing related statistics. According to Miggo, attackers could use the flaw to map an organization's virtual host, infer business activity, and collect intelligence for future attacks, particularly in multi-tenant environments where multiple teams or applications share the same virtual host.
To reduce exposure to the RabbitMQ vulnerability, organizations are advised to update affected deployments immediately, restrict access to vulnerable systems if patching cannot be performed, prevent public exposure of the management interface, implement network segmentation, and rotate OAuth client secrets.
Although there is currently no evidence that CVE-2026-5721 has been exploited in the wild, Miggo noted, "Neither of these RabbitMQ bugs is exotic. They sat in the codebase for over two years. They are precisely the kind of quiet, systemic inconsistency that hides in mature, widely deployed software: the kind a human reviewer reads past, and a single-pass tool fails to compare against everything around it."
Vollständiges Original-Advisory
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