Authorization Bypass in OpsTree BuildPiper

Executive Summary

CVE-2026-127077 is an authorization bypass vulnerability in OpsTree BuildPiper versions before 2.7.0. It allows authenticated users to create environments on unassigned Kubernetes clusters by tampering with cluster_id and namespaces values in API requests. Attackers can modify POST requests to /api/v1/project/{project_id}/env/ to target another project's cluster, bypassing project isolation controls.

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Detection Guidance

To detect this vulnerability, monitor API requests to /api/v1/project/{project_id}/env/ for unauthorized modifications to cluster_id and namespaces parameters. Check for requests where users attempt to access clusters or namespaces not assigned to their project. Review logs for suspicious environment creation activities or deployments into unauthorized clusters.

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Impact Analysis

This vulnerability enables attackers to deploy resources into unauthorized clusters or namespaces, potentially affecting production environments or other teams' namespaces. It compromises tenant and environment isolation, allowing unauthorized access to sensitive systems or data.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating compliance requirements such as GDPR (data protection) or HIPAA (healthcare data). It undermines role-based access controls and audit trails, potentially resulting in non-compliance penalties or data breaches.

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Mitigation Strategies

Immediately upgrade to BuildPiper version 2.7.0 or later to apply the vendor's fix. Implement server-side validation to ensure cluster_id and namespaces values match assigned project resources. Review and restrict API access permissions to prevent unauthorized modifications. Monitor and audit environment creation requests for anomalies.

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