CVE-2026-70398 in Advanced Cluster Management for Kubernetes
Summary
by MITRE • 08/12/2026
A flaw was found in multicloud-integrations, a component of Red Hat Advanced Cluster Management (RHACM). This vulnerability allows an authenticated user, referred to as a tenant, to manipulate the GitOpsCluster controller. By exploiting this, a tenant can redirect sensitive spoke cluster bearer tokens from secure locations to a namespace they control. This unauthorized access to tokens can lead to the disclosure of critical information and bypass security policies within ArgoCD AppProjects.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability resides within the multicloud-integrations component of Red Hat Advanced Cluster Management, specifically affecting the GitOpsCluster controller functionality. The flaw represents a critical authorization bypass that enables authenticated tenants to manipulate cluster controller behavior through improper access control mechanisms. The technical implementation allows for token redirection from secure storage locations to namespaces controlled by the malicious tenant, creating an unauthorized access pathway that undermines fundamental security boundaries within the multicloud environment.
The vulnerability stems from inadequate validation and access controls within the GitOpsCluster controller's token handling processes. When a tenant manipulates this controller, they can redirect bearer tokens that should remain isolated in secure namespaces to locations under their control. This manipulation exploits weaknesses in the controller's trust model and namespace isolation mechanisms, effectively allowing privilege escalation through unauthorized token redistribution. The flaw specifically targets the secure storage and handling of sensitive spoke cluster credentials, which are essential for maintaining cluster integrity and access control.
Operational impact of this vulnerability extends beyond simple credential exposure to encompass complete bypass of ArgoCD AppProject security policies. Once tokens are redirected to a controlled namespace, the tenant gains unauthorized access to multiple clusters within the multicloud environment, potentially compromising hundreds or thousands of managed workloads. The disclosure of sensitive information includes not only bearer tokens but also associated cluster metadata and configuration data that could enable further exploitation. This vulnerability particularly affects organizations relying on RHACM for multi-tenant cluster management where proper segregation between tenants is critical.
Mitigation strategies must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. Organizations should implement strict namespace isolation controls, enforce mandatory access controls on token handling processes, and establish comprehensive monitoring for unauthorized token redirection activities. The fix requires strengthening the GitOpsCluster controller's validation mechanisms and implementing proper privilege separation between tenant and system-level operations. Security teams should also establish automated detection capabilities for suspicious controller manipulations and ensure regular security auditing of multicloud integration components. This vulnerability aligns with CWE-284 (Improper Access Control) and maps to ATT&CK technique T1078 (Valid Accounts) as it exploits legitimate tenant credentials for unauthorized access.
The broader implications highlight the critical need for secure multi-tenant architecture design in cloud-native environments where controller-based orchestration systems can become attack vectors. Organizations must implement defense-in-depth strategies that include least privilege principles, regular security assessments of integration components, and robust monitoring for unauthorized access patterns. The vulnerability demonstrates how seemingly isolated controller components can create cascading security failures when proper access controls are not enforced across the entire multicloud management stack.