Temporal Web UI is a graphical interface used by developers and operations teams to visualize and manage workflows in distributed systems. It provides real-time monitoring, workflow execution control, and debugging capabilities. Organizations rely on it to oversee complex background job processing, ensuring reliability and scalability. Typically deployed internally or via cloud, it is critical for maintaining operational efficiency in microservices architectures.
Unauthenticated Access vulnerability arises when the Temporal Web UI fails to enforce authentication on its endpoints. This occurs due to misconfigurations, default settings, or oversight during deployment. Attackers can exploit this by directly accessing the UI without login credentials, gaining visibility into workflow states and sensitive metadata. The vulnerability stems from insufficient access controls on the web server or application layer.
Specifically, the vulnerability affects the Temporal Web UI's main dashboard and API endpoints such as /namespaces/default/workflows and /api/v1/namespaces. These endpoints expose workflow lists, execution histories, and task queue details. Without authentication, an attacker can enumerate workflows, view input/output data, and even trigger new workflow executions or cancel existing ones, depending on the configuration.
If exploited, an attacker can gain unauthorized control over critical business workflows, potentially disrupting operations, stealing sensitive data, or launching further attacks. This can lead to data breaches, service downtime, and compliance violations. The CVSS score of 7.0 reflects the high impact on confidentiality, integrity, and availability, making remediation urgent.
- Enable authentication on the Temporal Web UI by configuring an identity provider (e.g., OAuth, LDAP) in the Temporal server settings.
- Restrict network access to the Temporal Web UI using firewalls or VPNs, limiting exposure to trusted IP ranges only.
- Implement role-based access control (RBAC) to ensure users have only necessary permissions for workflow operations.
- Regularly audit Temporal Web UI access logs to detect unauthorized access attempts and review configurations.
- Update Temporal server to the latest version to apply security patches and improved authentication features.
- Disable or remove default admin accounts and enforce strong password policies for all users.
- Use HTTPS with valid TLS certificates to encrypt traffic and prevent credential interception.
- Conduct periodic vulnerability scans using tools like S4E to identify and remediate unauthenticated access issues.
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