CVE-2026-50237 in OpenShift
Summary
by MITRE • 08/11/2026
A Server-Side Request Forgery and supply chain flaw was found in the OpenShift Console Helm catalog proxy. A namespace tenant can plant a ProjectHelmChartRepository with an arbitrary URL that the console pod fetches server-side, bypassing tenant egress restrictions. Combined with catalog metadata poisoning and admin-mediated chart installation, this enables privilege escalation.
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Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical server-side request forgery flaw in the OpenShift Console Helm catalog proxy that fundamentally undermines the platform's security boundaries. The issue stems from the console pod's indiscriminate fetching of URLs provided by namespace tenants through ProjectHelmChartRepository resources without proper validation or restriction mechanisms. This design flaw allows malicious actors to craft arbitrary URLs that bypass tenant egress restrictions, effectively enabling unauthorized server-side requests to internal or external systems. The vulnerability aligns with CWE-918 Server-Side Request Forgery and maps directly to ATT&CK technique T1078 Valid Accounts and T1566 Phishing, as it leverages legitimate console functionality to execute malicious requests.
The operational impact of this vulnerability extends far beyond simple information disclosure, creating a pathway for privilege escalation through supply chain compromise. When combined with catalog metadata poisoning techniques, attackers can manipulate the Helm chart repository metadata to redirect requests to malicious endpoints while maintaining the appearance of legitimate charts. The attack vector becomes particularly dangerous when an administrator performs chart installation operations, as the console pod will fetch and process the malicious content from the attacker-controlled URL. This scenario creates a perfect storm where tenant-level access can be escalated to administrative privileges through the manipulation of the Helm catalog system.
The security implications of this flaw are severe as it completely bypasses the intended multi-tenant isolation mechanisms within OpenShift. Tenant egress restrictions designed to prevent unauthorized network access are circumvented, allowing malicious actors to probe internal networks, access sensitive systems, or exfiltrate data through legitimate console infrastructure. The vulnerability demonstrates a fundamental breakdown in the principle of least privilege, where a namespace tenant can potentially gain access to resources they should not be able to reach through normal administrative boundaries. This weakness enables attackers to perform reconnaissance and lateral movement within the cluster environment without triggering traditional network-based detection mechanisms.
Mitigation strategies must address both the immediate technical flaw and the broader architectural considerations of Helm catalog management within containerized platforms. Organizations should implement strict URL validation and whitelisting for ProjectHelmChartRepository resources, ensuring that only pre-approved domains or IP ranges are permitted. Network policies should be enforced to restrict outbound connections from console pods to known safe destinations, while also implementing comprehensive monitoring for unusual outbound requests. The solution must incorporate proper input sanitization and validation mechanisms that prevent arbitrary URL resolution, aligning with ATT&CK mitigation techniques focused on preventing command and control communications. Additionally, administrators should implement regular audit procedures to detect unauthorized chart repository configurations and establish clear separation of duties between tenant access and administrative functions.