CVE-2026-17192 in VeloCloud Orchestrator On-Prem
Summary
by MITRE • 07/27/2026
A VCO feature does not sufficiently validate caller-supplied input, allowing requests to be made on behalf of authenticated tenant accounts to internal services that are not otherwise accessible. This vulnerability requires a minimum role of Enterprise Standard Admin.
This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.
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Analysis
by VulDB Data Team • 07/27/2026
The vulnerability described represents a critical authentication bypass flaw within a VCO (Virtual Cloud Orchestrator) system that enables unauthorized access to internal services through legitimate tenant accounts. This weakness stems from inadequate input validation mechanisms that fail to properly sanitize or verify caller-supplied parameters, creating a pathway for privilege escalation attacks. The vulnerability specifically targets the authentication and authorization controls that should normally prevent unauthorized access to sensitive internal services, allowing attackers with minimal privileges to impersonate authenticated users and gain access to resources they should not be able to reach.
The technical implementation of this flaw demonstrates a classic case of insufficient validation of user-supplied input, which aligns with common weakness patterns identified in the CWE database under categories related to input validation and authentication bypass. The vulnerability requires an attacker to possess at least an Enterprise Standard Admin role, indicating that it operates within the context of an already compromised administrative account or one with sufficient privileges to make requests to the vulnerable system components. This prerequisite suggests that the attack vector likely involves a form of privilege escalation or lateral movement rather than initial access through external exploitation.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables attackers to potentially compromise internal services that should remain isolated from tenant-facing interfaces. The affected services are described as "not otherwise accessible," implying that they contain sensitive functionality or data that normally resides behind additional security controls and access layers. This creates a significant risk for organizations relying on the VCO system for cloud infrastructure management, as successful exploitation could allow attackers to gain visibility into internal operations, potentially leading to further compromise of adjacent systems or data exfiltration.
Security professionals should note that this vulnerability operates within the context of enterprise cloud environments where multi-tenant isolation is critical for maintaining security boundaries. The fact that Arista discovered this internally without evidence of malicious exploitation in customer networks suggests that the attack surface may be limited, but the potential impact remains significant given the access level required and the sensitive nature of the internal services involved. Organizations should consider implementing additional monitoring around authentication and authorization events, particularly for requests originating from administrative accounts that attempt to access internal service endpoints.
The vulnerability's characteristics align with ATT&CK techniques related to privilege escalation and lateral movement, specifically targeting the credential access and defense evasion phases where attackers seek to establish persistent access or move within compromised environments. While the minimum required role suggests this may not be an initial access vector, it could represent a critical step in multi-stage attacks where attackers leverage existing administrative access to expand their operational capabilities within the cloud infrastructure.
Mitigation strategies should focus on implementing robust input validation controls for all caller-supplied parameters, particularly those used in authentication and authorization workflows. Organizations should consider deploying additional access controls and monitoring mechanisms that can detect anomalous behavior patterns when authenticated accounts attempt to access services outside their normal operational scope. The discovery of this vulnerability internally by Arista indicates that proper security testing and code review processes were effective in identifying the issue before it could be exploited in production environments, highlighting the importance of continuous security assessment practices.
Security teams should also evaluate their existing monitoring capabilities to ensure they can detect unauthorized access attempts to internal services through authenticated accounts, particularly those with elevated privileges. The vulnerability's nature suggests that implementing proper separation of concerns between tenant-facing interfaces and internal service endpoints would provide effective defense against similar issues. Additionally, organizations should review their administrative access controls and ensure that least privilege principles are properly enforced to minimize the potential impact of such vulnerabilities when they do occur.